| 1 | /* |
| 2 | * snprintf.c - a portable implementation of snprintf |
| 3 | * |
| 4 | * AUTHOR |
| 5 | * Mark Martinec <mark.martinec@ijs.si>, April 1999. |
| 6 | * |
| 7 | * Copyright 1999, Mark Martinec. All rights reserved. |
| 8 | * |
| 9 | * TERMS AND CONDITIONS |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the "Frontier Artistic License" which comes |
| 12 | * with this Kit. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty |
| 16 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| 17 | * See the Frontier Artistic License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the Frontier Artistic License |
| 20 | * with this Kit in the file named LICENSE.txt . |
| 21 | * If not, I'll be glad to provide one. |
| 22 | * |
| 23 | * FEATURES |
| 24 | * - careful adherence to specs regarding flags, field width and precision; |
| 25 | * - good performance for large string handling (large format, large |
| 26 | * argument or large paddings). Performance is similar to system's sprintf |
| 27 | * and in several cases significantly better (make sure you compile with |
| 28 | * optimizations turned on, tell the compiler the code is strict ANSI |
| 29 | * if necessary to give it more freedom for optimizations); |
| 30 | * - return value semantics per ISO/IEC 9899:1999 ("ISO C99"); |
| 31 | * - written in standard ISO/ANSI C - requires an ANSI C compiler. |
| 32 | * |
| 33 | * SUPPORTED CONVERSION SPECIFIERS AND DATA TYPES |
| 34 | * |
| 35 | * This snprintf only supports the following conversion specifiers: |
| 36 | * s, c, d, u, o, x, X, p (and synonyms: i, D, U, O - see below) |
| 37 | * with flags: '-', '+', ' ', '0' and '#'. |
| 38 | * An asterisk is supported for field width as well as precision. |
| 39 | * |
| 40 | * Length modifiers 'h' (short int), 'l' (long int), |
| 41 | * and 'll' (long long int) are supported. |
| 42 | * NOTE: |
| 43 | * If macro SNPRINTF_LONGLONG_SUPPORT is not defined (default) the |
| 44 | * length modifier 'll' is recognized but treated the same as 'l', |
| 45 | * which may cause argument value truncation! Defining |
| 46 | * SNPRINTF_LONGLONG_SUPPORT requires that your system's sprintf also |
| 47 | * handles length modifier 'll'. long long int is a language extension |
| 48 | * which may not be portable. |
| 49 | * |
| 50 | * Conversion of numeric data (conversion specifiers d, u, o, x, X, p) |
| 51 | * with length modifiers (none or h, l, ll) is left to the system routine |
| 52 | * sprintf, but all handling of flags, field width and precision as well as |
| 53 | * c and s conversions is done very carefully by this portable routine. |
| 54 | * If a string precision (truncation) is specified (e.g. %.8s) it is |
| 55 | * guaranteed the string beyond the specified precision will not be referenced. |
| 56 | * |
| 57 | * Length modifiers h, l and ll are ignored for c and s conversions (data |
| 58 | * types wint_t and wchar_t are not supported). |
| 59 | * |
| 60 | * The following common synonyms for conversion characters are supported: |
| 61 | * - i is a synonym for d |
| 62 | * - D is a synonym for ld, explicit length modifiers are ignored |
| 63 | * - U is a synonym for lu, explicit length modifiers are ignored |
| 64 | * - O is a synonym for lo, explicit length modifiers are ignored |
| 65 | * The D, O and U conversion characters are nonstandard, they are supported |
| 66 | * for backward compatibility only, and should not be used for new code. |
| 67 | * |
| 68 | * The following is specifically NOT supported: |
| 69 | * - flag ' (thousands' grouping character) is recognized but ignored |
| 70 | * - numeric conversion specifiers: f, e, E, g, G and synonym F, |
| 71 | * as well as the new a and A conversion specifiers |
| 72 | * - length modifier 'L' (long double) and 'q' (quad - use 'll' instead) |
| 73 | * - wide character/string conversions: lc, ls, and nonstandard |
| 74 | * synonyms C and S |
| 75 | * - writeback of converted string length: conversion character n |
| 76 | * - the n$ specification for direct reference to n-th argument |
| 77 | * - locales |
| 78 | * |
| 79 | * It is permitted for str_m to be zero, and it is permitted to specify NULL |
| 80 | * pointer for resulting string argument if str_m is zero (as per ISO C99). |
| 81 | * |
| 82 | * The return value is the number of characters which would be generated |
| 83 | * for the given input, excluding the trailing null. If this value |
| 84 | * is greater or equal to str_m, not all characters from the result |
| 85 | * have been stored in str, output bytes beyond the (str_m-1) -th character |
| 86 | * are discarded. If str_m is greater than zero it is guaranteed |
| 87 | * the resulting string will be null-terminated. |
| 88 | * |
| 89 | * NOTE that this matches the ISO C99, OpenBSD, and GNU C library 2.1, |
| 90 | * but is different from some older and vendor implementations, |
| 91 | * and is also different from XPG, XSH5, SUSv2 specifications. |
| 92 | * For historical discussion on changes in the semantics and standards |
| 93 | * of snprintf see printf(3) man page in the Linux programmers manual. |
| 94 | * |
| 95 | * Routines asprintf and vasprintf return a pointer (in the ptr argument) |
| 96 | * to a buffer sufficiently large to hold the resulting string. This pointer |
| 97 | * should be passed to free(3) to release the allocated storage when it is |
| 98 | * no longer needed. If sufficient space cannot be allocated, these functions |
| 99 | * will return -1 and set ptr to be a NULL pointer. These two routines are a |
| 100 | * GNU C library extensions (glibc). |
| 101 | * |
| 102 | * Routines asnprintf and vasnprintf are similar to asprintf and vasprintf, |
| 103 | * yet, like snprintf and vsnprintf counterparts, will write at most str_m-1 |
| 104 | * characters into the allocated output string, the last character in the |
| 105 | * allocated buffer then gets the terminating null. If the formatted string |
| 106 | * length (the return value) is greater than or equal to the str_m argument, |
| 107 | * the resulting string was truncated and some of the formatted characters |
| 108 | * were discarded. These routines present a handy way to limit the amount |
| 109 | * of allocated memory to some sane value. |
| 110 | * |
| 111 | * AVAILABILITY |
| 112 | * http://www.ijs.si/software/snprintf/ |
| 113 | * |
| 114 | * REVISION HISTORY |
| 115 | * 1999-04 V0.9 Mark Martinec |
| 116 | * - initial version, some modifications after comparing printf |
| 117 | * man pages for Digital Unix 4.0, Solaris 2.6 and HPUX 10, |
| 118 | * and checking how Perl handles sprintf (differently!); |
| 119 | * 1999-04-09 V1.0 Mark Martinec <mark.martinec@ijs.si> |
| 120 | * - added main test program, fixed remaining inconsistencies, |
| 121 | * added optional (long long int) support; |
| 122 | * 1999-04-12 V1.1 Mark Martinec <mark.martinec@ijs.si> |
| 123 | * - support the 'p' conversion (pointer to void); |
| 124 | * - if a string precision is specified |
| 125 | * make sure the string beyond the specified precision |
| 126 | * will not be referenced (e.g. by strlen); |
| 127 | * 1999-04-13 V1.2 Mark Martinec <mark.martinec@ijs.si> |
| 128 | * - support synonyms %D=%ld, %U=%lu, %O=%lo; |
| 129 | * - speed up the case of long format string with few conversions; |
| 130 | * 1999-06-30 V1.3 Mark Martinec <mark.martinec@ijs.si> |
| 131 | * - fixed runaway loop (eventually crashing when str_l wraps |
| 132 | * beyond 2^31) while copying format string without |
| 133 | * conversion specifiers to a buffer that is too short |
| 134 | * (thanks to Edwin Young <edwiny@autonomy.com> for |
| 135 | * spotting the problem); |
| 136 | * - added macros PORTABLE_SNPRINTF_VERSION_(MAJOR|MINOR) |
| 137 | * to snprintf.h |
| 138 | * 2000-02-14 V2.0 (never released) Mark Martinec <mark.martinec@ijs.si> |
| 139 | * - relaxed license terms: The Artistic License now applies. |
| 140 | * You may still apply the GNU GENERAL PUBLIC LICENSE |
| 141 | * as was distributed with previous versions, if you prefer; |
| 142 | * - changed REVISION HISTORY dates to use ISO 8601 date format; |
| 143 | * - added vsnprintf (patch also independently proposed by |
| 144 | * Caolan McNamara 2000-05-04, and Keith M Willenson 2000-06-01) |
| 145 | * 2000-06-27 V2.1 Mark Martinec <mark.martinec@ijs.si> |
| 146 | * - removed POSIX check for str_m<1; value 0 for str_m is |
| 147 | * allowed by ISO C99 (and GNU C library 2.1) - (pointed out |
| 148 | * on 2000-05-04 by Caolan McNamara, caolan@ csn dot ul dot ie). |
| 149 | * Besides relaxed license this change in standards adherence |
| 150 | * is the main reason to bump up the major version number; |
| 151 | * - added nonstandard routines asnprintf, vasnprintf, asprintf, |
| 152 | * vasprintf that dynamically allocate storage for the |
| 153 | * resulting string; these routines are not compiled by default, |
| 154 | * see comments where NEED_V?ASN?PRINTF macros are defined; |
| 155 | * - autoconf contributed by Caolan McNamara |
| 156 | * 2000-10-06 V2.2 Mark Martinec <mark.martinec@ijs.si> |
| 157 | * - BUG FIX: the %c conversion used a temporary variable |
| 158 | * that was no longer in scope when referenced, |
| 159 | * possibly causing incorrect resulting character; |
| 160 | * - BUG FIX: make precision and minimal field width unsigned |
| 161 | * to handle huge values (2^31 <= n < 2^32) correctly; |
| 162 | * also be more careful in the use of signed/unsigned/size_t |
| 163 | * internal variables - probably more careful than many |
| 164 | * vendor implementations, but there may still be a case |
| 165 | * where huge values of str_m, precision or minimal field |
| 166 | * could cause incorrect behaviour; |
| 167 | * - use separate variables for signed/unsigned arguments, |
| 168 | * and for short/int, long, and long long argument lengths |
| 169 | * to avoid possible incompatibilities on certain |
| 170 | * computer architectures. Also use separate variable |
| 171 | * arg_sign to hold sign of a numeric argument, |
| 172 | * to make code more transparent; |
| 173 | * - some fiddling with zero padding and "0x" to make it |
| 174 | * Linux compatible; |
| 175 | * - systematically use macros fast_memcpy and fast_memset |
| 176 | * instead of case-by-case hand optimization; determine some |
| 177 | * breakeven string lengths for different architectures; |
| 178 | * - terminology change: 'format' -> 'conversion specifier', |
| 179 | * 'C9x' -> 'ISO/IEC 9899:1999 ("ISO C99")', |
| 180 | * 'alternative form' -> 'alternate form', |
| 181 | * 'data type modifier' -> 'length modifier'; |
| 182 | * - several comments rephrased and new ones added; |
| 183 | * - make compiler not complain about 'credits' defined but |
| 184 | * not used; |
| 185 | */ |
| 186 | |
| 187 | |
| 188 | /* Define HAVE_SNPRINTF if your system already has snprintf and vsnprintf. |
| 189 | * |
| 190 | * If HAVE_SNPRINTF is defined this module will not produce code for |
| 191 | * snprintf and vsnprintf, unless PREFER_PORTABLE_SNPRINTF is defined as well, |
| 192 | * causing this portable version of snprintf to be called portable_snprintf |
| 193 | * (and portable_vsnprintf). |
| 194 | */ |
| 195 | /* #define HAVE_SNPRINTF */ |
| 196 | |
| 197 | /* Define PREFER_PORTABLE_SNPRINTF if your system does have snprintf and |
| 198 | * vsnprintf but you would prefer to use the portable routine(s) instead. |
| 199 | * In this case the portable routine is declared as portable_snprintf |
| 200 | * (and portable_vsnprintf) and a macro 'snprintf' (and 'vsnprintf') |
| 201 | * is defined to expand to 'portable_v?snprintf' - see file snprintf.h . |
| 202 | * Defining this macro is only useful if HAVE_SNPRINTF is also defined, |
| 203 | * but does does no harm if defined nevertheless. |
| 204 | */ |
| 205 | /* #define PREFER_PORTABLE_SNPRINTF */ |
| 206 | |
| 207 | /* Define SNPRINTF_LONGLONG_SUPPORT if you want to support |
| 208 | * data type (long long int) and length modifier 'll' (e.g. %lld). |
| 209 | * If undefined, 'll' is recognized but treated as a single 'l'. |
| 210 | * |
| 211 | * If the system's sprintf does not handle 'll' |
| 212 | * the SNPRINTF_LONGLONG_SUPPORT must not be defined! |
| 213 | * |
| 214 | * This is off by default as (long long int) is a language extension. |
| 215 | */ |
| 216 | /* #define SNPRINTF_LONGLONG_SUPPORT */ |
| 217 | |
| 218 | /* Define NEED_SNPRINTF_ONLY if you only need snprintf, and not vsnprintf. |
| 219 | * If NEED_SNPRINTF_ONLY is defined, the snprintf will be defined directly, |
| 220 | * otherwise both snprintf and vsnprintf routines will be defined |
| 221 | * and snprintf will be a simple wrapper around vsnprintf, at the expense |
| 222 | * of an extra procedure call. |
| 223 | */ |
| 224 | /* #define NEED_SNPRINTF_ONLY */ |
| 225 | |
| 226 | /* Define NEED_V?ASN?PRINTF macros if you need library extension |
| 227 | * routines asprintf, vasprintf, asnprintf, vasnprintf respectively, |
| 228 | * and your system library does not provide them. They are all small |
| 229 | * wrapper routines around portable_vsnprintf. Defining any of the four |
| 230 | * NEED_V?ASN?PRINTF macros automatically turns off NEED_SNPRINTF_ONLY |
| 231 | * and turns on PREFER_PORTABLE_SNPRINTF. |
| 232 | * |
| 233 | * Watch for name conflicts with the system library if these routines |
| 234 | * are already present there. |
| 235 | * |
| 236 | * NOTE: vasprintf and vasnprintf routines need va_copy() from stdarg.h, as |
| 237 | * specified by C99, to be able to traverse the same list of arguments twice. |
| 238 | * I don't know of any other standard and portable way of achieving the same. |
| 239 | * With some versions of gcc you may use __va_copy(). You might even get away |
| 240 | * with "ap2 = ap", in this case you must not call va_end(ap2) ! |
| 241 | * #define va_copy(ap2,ap) ap2 = ap |
| 242 | */ |
| 243 | /* #define NEED_ASPRINTF */ |
| 244 | /* #define NEED_ASNPRINTF */ |
| 245 | /* #define NEED_VASPRINTF */ |
| 246 | /* #define NEED_VASNPRINTF */ |
| 247 | |
| 248 | |
| 249 | /* Define the following macros if desired: |
| 250 | * SOLARIS_COMPATIBLE, SOLARIS_BUG_COMPATIBLE, |
| 251 | * HPUX_COMPATIBLE, HPUX_BUG_COMPATIBLE, LINUX_COMPATIBLE, |
| 252 | * DIGITAL_UNIX_COMPATIBLE, DIGITAL_UNIX_BUG_COMPATIBLE, |
| 253 | * PERL_COMPATIBLE, PERL_BUG_COMPATIBLE, |
| 254 | * |
| 255 | * - For portable applications it is best not to rely on peculiarities |
| 256 | * of a given implementation so it may be best not to define any |
| 257 | * of the macros that select compatibility and to avoid features |
| 258 | * that vary among the systems. |
| 259 | * |
| 260 | * - Selecting compatibility with more than one operating system |
| 261 | * is not strictly forbidden but is not recommended. |
| 262 | * |
| 263 | * - 'x'_BUG_COMPATIBLE implies 'x'_COMPATIBLE . |
| 264 | * |
| 265 | * - 'x'_COMPATIBLE refers to (and enables) a behaviour that is |
| 266 | * documented in a sprintf man page on a given operating system |
| 267 | * and actually adhered to by the system's sprintf (but not on |
| 268 | * most other operating systems). It may also refer to and enable |
| 269 | * a behaviour that is declared 'undefined' or 'implementation specific' |
| 270 | * in the man page but a given implementation behaves predictably |
| 271 | * in a certain way. |
| 272 | * |
| 273 | * - 'x'_BUG_COMPATIBLE refers to (and enables) a behaviour of system's sprintf |
| 274 | * that contradicts the sprintf man page on the same operating system. |
| 275 | * |
| 276 | * - I do not claim that the 'x'_COMPATIBLE and 'x'_BUG_COMPATIBLE |
| 277 | * conditionals take into account all idiosyncrasies of a particular |
| 278 | * implementation, there may be other incompatibilities. |
| 279 | */ |
| 280 | |
| 281 | |
| 282 | #warning Platform has no snprintf?! Please check included snprintf.c for sanity! |
| 283 | |
| 284 | \f |
| 285 | /* ============================================= */ |
| 286 | /* NO USER SERVICABLE PARTS FOLLOWING THIS POINT */ |
| 287 | /* ============================================= */ |
| 288 | |
| 289 | #define PORTABLE_SNPRINTF_VERSION_MAJOR 2 |
| 290 | #define PORTABLE_SNPRINTF_VERSION_MINOR 2 |
| 291 | |
| 292 | #if defined(NEED_ASPRINTF) || defined(NEED_ASNPRINTF) || defined(NEED_VASPRINTF) || defined(NEED_VASNPRINTF) |
| 293 | # if defined(NEED_SNPRINTF_ONLY) |
| 294 | # undef NEED_SNPRINTF_ONLY |
| 295 | # endif |
| 296 | # if !defined(PREFER_PORTABLE_SNPRINTF) |
| 297 | # define PREFER_PORTABLE_SNPRINTF |
| 298 | # endif |
| 299 | #endif |
| 300 | |
| 301 | #if defined(SOLARIS_BUG_COMPATIBLE) && !defined(SOLARIS_COMPATIBLE) |
| 302 | #define SOLARIS_COMPATIBLE |
| 303 | #endif |
| 304 | |
| 305 | #if defined(HPUX_BUG_COMPATIBLE) && !defined(HPUX_COMPATIBLE) |
| 306 | #define HPUX_COMPATIBLE |
| 307 | #endif |
| 308 | |
| 309 | #if defined(DIGITAL_UNIX_BUG_COMPATIBLE) && !defined(DIGITAL_UNIX_COMPATIBLE) |
| 310 | #define DIGITAL_UNIX_COMPATIBLE |
| 311 | #endif |
| 312 | |
| 313 | #if defined(PERL_BUG_COMPATIBLE) && !defined(PERL_COMPATIBLE) |
| 314 | #define PERL_COMPATIBLE |
| 315 | #endif |
| 316 | |
| 317 | #if defined(LINUX_BUG_COMPATIBLE) && !defined(LINUX_COMPATIBLE) |
| 318 | #define LINUX_COMPATIBLE |
| 319 | #endif |
| 320 | |
| 321 | #include <sys/types.h> |
| 322 | #include <string.h> |
| 323 | #include <stdlib.h> |
| 324 | #include <stdio.h> |
| 325 | #include <stdarg.h> |
| 326 | #include <assert.h> |
| 327 | #include <errno.h> |
| 328 | |
| 329 | #ifdef isdigit |
| 330 | #undef isdigit |
| 331 | #endif |
| 332 | #define isdigit(c) ((c) >= '0' && (c) <= '9') |
| 333 | |
| 334 | /* For copying strings longer or equal to 'breakeven_point' |
| 335 | * it is more efficient to call memcpy() than to do it inline. |
| 336 | * The value depends mostly on the processor architecture, |
| 337 | * but also on the compiler and its optimization capabilities. |
| 338 | * The value is not critical, some small value greater than zero |
| 339 | * will be just fine if you don't care to squeeze every drop |
| 340 | * of performance out of the code. |
| 341 | * |
| 342 | * Small values favor memcpy, large values favor inline code. |
| 343 | */ |
| 344 | #if defined(__alpha__) || defined(__alpha) |
| 345 | # define breakeven_point 2 /* AXP (DEC Alpha) - gcc or cc or egcs */ |
| 346 | #endif |
| 347 | #if defined(__i386__) || defined(__i386) |
| 348 | # define breakeven_point 12 /* Intel Pentium/Linux - gcc 2.96 */ |
| 349 | #endif |
| 350 | #if defined(__hppa) |
| 351 | # define breakeven_point 10 /* HP-PA - gcc */ |
| 352 | #endif |
| 353 | #if defined(__sparc__) || defined(__sparc) |
| 354 | # define breakeven_point 33 /* Sun Sparc 5 - gcc 2.8.1 */ |
| 355 | #endif |
| 356 | |
| 357 | /* some other values of possible interest: */ |
| 358 | /* #define breakeven_point 8 */ /* VAX 4000 - vaxc */ |
| 359 | /* #define breakeven_point 19 */ /* VAX 4000 - gcc 2.7.0 */ |
| 360 | |
| 361 | #ifndef breakeven_point |
| 362 | # define breakeven_point 6 /* some reasonable one-size-fits-all value */ |
| 363 | #endif |
| 364 | |
| 365 | #define fast_memcpy(d,s,n) \ |
| 366 | { register size_t nn = (size_t)(n); \ |
| 367 | if (nn >= breakeven_point) memcpy((d), (s), nn); \ |
| 368 | else if (nn > 0) { /* proc call overhead is worth only for large strings*/\ |
| 369 | register char *dd; register const char *ss; \ |
| 370 | for (ss=(s), dd=(d); nn>0; nn--) *dd++ = *ss++; } } |
| 371 | |
| 372 | #define fast_memset(d,c,n) \ |
| 373 | { register size_t nn = (size_t)(n); \ |
| 374 | if (nn >= breakeven_point) memset((d), (int)(c), nn); \ |
| 375 | else if (nn > 0) { /* proc call overhead is worth only for large strings*/\ |
| 376 | register char *dd; register const int cc=(int)(c); \ |
| 377 | for (dd=(d); nn>0; nn--) *dd++ = cc; } } |
| 378 | |
| 379 | /* prototypes */ |
| 380 | |
| 381 | #if defined(NEED_ASPRINTF) |
| 382 | int asprintf (char **ptr, const char *fmt, /*args*/ ...); |
| 383 | #endif |
| 384 | #if defined(NEED_VASPRINTF) |
| 385 | int vasprintf (char **ptr, const char *fmt, va_list ap); |
| 386 | #endif |
| 387 | #if defined(NEED_ASNPRINTF) |
| 388 | int asnprintf (char **ptr, size_t str_m, const char *fmt, /*args*/ ...); |
| 389 | #endif |
| 390 | #if defined(NEED_VASNPRINTF) |
| 391 | int vasnprintf (char **ptr, size_t str_m, const char *fmt, va_list ap); |
| 392 | #endif |
| 393 | |
| 394 | #if defined(HAVE_SNPRINTF) |
| 395 | /* declare our portable snprintf routine under name portable_snprintf */ |
| 396 | /* declare our portable vsnprintf routine under name portable_vsnprintf */ |
| 397 | #else |
| 398 | /* declare our portable routines under names snprintf and vsnprintf */ |
| 399 | #define portable_snprintf snprintf |
| 400 | #if !defined(NEED_SNPRINTF_ONLY) |
| 401 | #define portable_vsnprintf vsnprintf |
| 402 | #endif |
| 403 | #endif |
| 404 | |
| 405 | #if !defined(HAVE_SNPRINTF) || defined(PREFER_PORTABLE_SNPRINTF) |
| 406 | int portable_snprintf(char *str, size_t str_m, const char *fmt, /*args*/ ...); |
| 407 | #if !defined(NEED_SNPRINTF_ONLY) |
| 408 | int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap); |
| 409 | #endif |
| 410 | #endif |
| 411 | |
| 412 | /* declarations */ |
| 413 | |
| 414 | static char credits[] = "\n\ |
| 415 | @(#)snprintf.c, v2.2: Mark Martinec, <mark.martinec@ijs.si>\n\ |
| 416 | @(#)snprintf.c, v2.2: Copyright 1999, Mark Martinec. Frontier Artistic License applies.\n\ |
| 417 | @(#)snprintf.c, v2.2: http://www.ijs.si/software/snprintf/\n"; |
| 418 | |
| 419 | #if defined(NEED_ASPRINTF) |
| 420 | int asprintf(char **ptr, const char *fmt, /*args*/ ...) { |
| 421 | va_list ap; |
| 422 | size_t str_m; |
| 423 | int str_l; |
| 424 | |
| 425 | *ptr = NULL; |
| 426 | va_start(ap, fmt); /* measure the required size */ |
| 427 | str_l = portable_vsnprintf(NULL, (size_t)0, fmt, ap); |
| 428 | va_end(ap); |
| 429 | assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */ |
| 430 | *ptr = (char *) malloc(str_m = (size_t)str_l + 1); |
| 431 | if (*ptr == NULL) { errno = ENOMEM; str_l = -1; } |
| 432 | else { |
| 433 | int str_l2; |
| 434 | va_start(ap, fmt); |
| 435 | str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap); |
| 436 | va_end(ap); |
| 437 | assert(str_l2 == str_l); |
| 438 | } |
| 439 | return str_l; |
| 440 | } |
| 441 | #endif |
| 442 | |
| 443 | #if defined(NEED_VASPRINTF) |
| 444 | int vasprintf(char **ptr, const char *fmt, va_list ap) { |
| 445 | size_t str_m; |
| 446 | int str_l; |
| 447 | |
| 448 | *ptr = NULL; |
| 449 | { va_list ap2; |
| 450 | va_copy(ap2, ap); /* don't consume the original ap, we'll need it again */ |
| 451 | str_l = portable_vsnprintf(NULL, (size_t)0, fmt, ap2);/*get required size*/ |
| 452 | va_end(ap2); |
| 453 | } |
| 454 | assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */ |
| 455 | *ptr = (char *) malloc(str_m = (size_t)str_l + 1); |
| 456 | if (*ptr == NULL) { errno = ENOMEM; str_l = -1; } |
| 457 | else { |
| 458 | int str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap); |
| 459 | assert(str_l2 == str_l); |
| 460 | } |
| 461 | return str_l; |
| 462 | } |
| 463 | #endif |
| 464 | |
| 465 | #if defined(NEED_ASNPRINTF) |
| 466 | int asnprintf (char **ptr, size_t str_m, const char *fmt, /*args*/ ...) { |
| 467 | va_list ap; |
| 468 | int str_l; |
| 469 | |
| 470 | *ptr = NULL; |
| 471 | va_start(ap, fmt); /* measure the required size */ |
| 472 | str_l = portable_vsnprintf(NULL, (size_t)0, fmt, ap); |
| 473 | va_end(ap); |
| 474 | assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */ |
| 475 | if ((size_t)str_l + 1 < str_m) str_m = (size_t)str_l + 1; /* truncate */ |
| 476 | /* if str_m is 0, no buffer is allocated, just set *ptr to NULL */ |
| 477 | if (str_m == 0) { /* not interested in resulting string, just return size */ |
| 478 | } else { |
| 479 | *ptr = (char *) malloc(str_m); |
| 480 | if (*ptr == NULL) { errno = ENOMEM; str_l = -1; } |
| 481 | else { |
| 482 | int str_l2; |
| 483 | va_start(ap, fmt); |
| 484 | str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap); |
| 485 | va_end(ap); |
| 486 | assert(str_l2 == str_l); |
| 487 | } |
| 488 | } |
| 489 | return str_l; |
| 490 | } |
| 491 | #endif |
| 492 | |
| 493 | #if defined(NEED_VASNPRINTF) |
| 494 | int vasnprintf (char **ptr, size_t str_m, const char *fmt, va_list ap) { |
| 495 | int str_l; |
| 496 | |
| 497 | *ptr = NULL; |
| 498 | { va_list ap2; |
| 499 | va_copy(ap2, ap); /* don't consume the original ap, we'll need it again */ |
| 500 | str_l = portable_vsnprintf(NULL, (size_t)0, fmt, ap2);/*get required size*/ |
| 501 | va_end(ap2); |
| 502 | } |
| 503 | assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */ |
| 504 | if ((size_t)str_l + 1 < str_m) str_m = (size_t)str_l + 1; /* truncate */ |
| 505 | /* if str_m is 0, no buffer is allocated, just set *ptr to NULL */ |
| 506 | if (str_m == 0) { /* not interested in resulting string, just return size */ |
| 507 | } else { |
| 508 | *ptr = (char *) malloc(str_m); |
| 509 | if (*ptr == NULL) { errno = ENOMEM; str_l = -1; } |
| 510 | else { |
| 511 | int str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap); |
| 512 | assert(str_l2 == str_l); |
| 513 | } |
| 514 | } |
| 515 | return str_l; |
| 516 | } |
| 517 | #endif |
| 518 | |
| 519 | /* |
| 520 | * If the system does have snprintf and the portable routine is not |
| 521 | * specifically required, this module produces no code for snprintf/vsnprintf. |
| 522 | */ |
| 523 | #if !defined(HAVE_SNPRINTF) || defined(PREFER_PORTABLE_SNPRINTF) |
| 524 | |
| 525 | #if !defined(NEED_SNPRINTF_ONLY) |
| 526 | int portable_snprintf(char *str, size_t str_m, const char *fmt, /*args*/ ...) { |
| 527 | va_list ap; |
| 528 | int str_l; |
| 529 | |
| 530 | va_start(ap, fmt); |
| 531 | str_l = portable_vsnprintf(str, str_m, fmt, ap); |
| 532 | va_end(ap); |
| 533 | return str_l; |
| 534 | } |
| 535 | #endif |
| 536 | |
| 537 | #if defined(NEED_SNPRINTF_ONLY) |
| 538 | int portable_snprintf(char *str, size_t str_m, const char *fmt, /*args*/ ...) { |
| 539 | #else |
| 540 | int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap) { |
| 541 | #endif |
| 542 | |
| 543 | #if defined(NEED_SNPRINTF_ONLY) |
| 544 | va_list ap; |
| 545 | #endif |
| 546 | size_t str_l = 0; |
| 547 | const char *p = fmt; |
| 548 | |
| 549 | /* In contrast with POSIX, the ISO C99 now says |
| 550 | * that str can be NULL and str_m can be 0. |
| 551 | * This is more useful than the old: if (str_m < 1) return -1; */ |
| 552 | |
| 553 | #if defined(NEED_SNPRINTF_ONLY) |
| 554 | va_start(ap, fmt); |
| 555 | #endif |
| 556 | if (!p) p = ""; |
| 557 | while (*p) { |
| 558 | if (*p != '%') { |
| 559 | /* if (str_l < str_m) str[str_l++] = *p++; -- this would be sufficient */ |
| 560 | /* but the following code achieves better performance for cases |
| 561 | * where format string is long and contains few conversions */ |
| 562 | const char *q = strchr(p+1,'%'); |
| 563 | size_t n = !q ? strlen(p) : (q-p); |
| 564 | if (str_l < str_m) { |
| 565 | size_t avail = str_m-str_l; |
| 566 | fast_memcpy(str+str_l, p, (n>avail?avail:n)); |
| 567 | } |
| 568 | p += n; str_l += n; |
| 569 | } else { |
| 570 | const char *starting_p; |
| 571 | size_t min_field_width = 0, precision = 0; |
| 572 | int zero_padding = 0, precision_specified = 0, justify_left = 0; |
| 573 | int alternate_form = 0, force_sign = 0; |
| 574 | int space_for_positive = 1; /* If both the ' ' and '+' flags appear, |
| 575 | the ' ' flag should be ignored. */ |
| 576 | char length_modifier = '\0'; /* allowed values: \0, h, l, L */ |
| 577 | char tmp[32];/* temporary buffer for simple numeric->string conversion */ |
| 578 | |
| 579 | const char *str_arg; /* string address in case of string argument */ |
| 580 | size_t str_arg_l; /* natural field width of arg without padding |
| 581 | and sign */ |
| 582 | unsigned char uchar_arg; |
| 583 | /* unsigned char argument value - only defined for c conversion. |
| 584 | N.B. standard explicitly states the char argument for |
| 585 | the c conversion is unsigned */ |
| 586 | |
| 587 | size_t number_of_zeros_to_pad = 0; |
| 588 | /* number of zeros to be inserted for numeric conversions |
| 589 | as required by the precision or minimal field width */ |
| 590 | |
| 591 | size_t zero_padding_insertion_ind = 0; |
| 592 | /* index into tmp where zero padding is to be inserted */ |
| 593 | |
| 594 | char fmt_spec = '\0'; |
| 595 | /* current conversion specifier character */ |
| 596 | |
| 597 | str_arg = credits;/* just to make compiler happy (defined but not used)*/ |
| 598 | str_arg = NULL; |
| 599 | starting_p = p; p++; /* skip '%' */ |
| 600 | /* parse flags */ |
| 601 | while (*p == '0' || *p == '-' || *p == '+' || |
| 602 | *p == ' ' || *p == '#' || *p == '\'') { |
| 603 | switch (*p) { |
| 604 | case '0': zero_padding = 1; break; |
| 605 | case '-': justify_left = 1; break; |
| 606 | case '+': force_sign = 1; space_for_positive = 0; break; |
| 607 | case ' ': force_sign = 1; |
| 608 | /* If both the ' ' and '+' flags appear, the ' ' flag should be ignored */ |
| 609 | #ifdef PERL_COMPATIBLE |
| 610 | /* ... but in Perl the last of ' ' and '+' applies */ |
| 611 | space_for_positive = 1; |
| 612 | #endif |
| 613 | break; |
| 614 | case '#': alternate_form = 1; break; |
| 615 | case '\'': break; |
| 616 | } |
| 617 | p++; |
| 618 | } |
| 619 | /* If the '0' and '-' flags both appear, the '0' flag should be ignored. */ |
| 620 | |
| 621 | /* parse field width */ |
| 622 | if (*p == '*') { |
| 623 | int j; |
| 624 | p++; j = va_arg(ap, int); |
| 625 | if (j >= 0) min_field_width = j; |
| 626 | else { min_field_width = -j; justify_left = 1; } |
| 627 | } else if (isdigit((int)(*p))) { |
| 628 | /* size_t could be wider than unsigned int; |
| 629 | make sure we treat argument like common implementations do */ |
| 630 | unsigned int uj = *p++ - '0'; |
| 631 | while (isdigit((int)(*p))) uj = 10*uj + (unsigned int)(*p++ - '0'); |
| 632 | min_field_width = uj; |
| 633 | } |
| 634 | /* parse precision */ |
| 635 | if (*p == '.') { |
| 636 | p++; precision_specified = 1; |
| 637 | if (*p == '*') { |
| 638 | int j = va_arg(ap, int); |
| 639 | p++; |
| 640 | if (j >= 0) precision = j; |
| 641 | else { |
| 642 | precision_specified = 0; precision = 0; |
| 643 | /* NOTE: |
| 644 | * Solaris 2.6 man page claims that in this case the precision |
| 645 | * should be set to 0. Digital Unix 4.0, HPUX 10 and BSD man page |
| 646 | * claim that this case should be treated as unspecified precision, |
| 647 | * which is what we do here. |
| 648 | */ |
| 649 | } |
| 650 | } else if (isdigit((int)(*p))) { |
| 651 | /* size_t could be wider than unsigned int; |
| 652 | make sure we treat argument like common implementations do */ |
| 653 | unsigned int uj = *p++ - '0'; |
| 654 | while (isdigit((int)(*p))) uj = 10*uj + (unsigned int)(*p++ - '0'); |
| 655 | precision = uj; |
| 656 | } |
| 657 | } |
| 658 | /* parse 'h', 'l' and 'll' length modifiers */ |
| 659 | if (*p == 'h' || *p == 'l') { |
| 660 | length_modifier = *p; p++; |
| 661 | if (length_modifier == 'l' && *p == 'l') { /* double l = long long */ |
| 662 | #ifdef SNPRINTF_LONGLONG_SUPPORT |
| 663 | length_modifier = '2'; /* double l encoded as '2' */ |
| 664 | #else |
| 665 | length_modifier = 'l'; /* treat it as a single 'l' */ |
| 666 | #endif |
| 667 | p++; |
| 668 | } |
| 669 | } |
| 670 | fmt_spec = *p; |
| 671 | /* common synonyms: */ |
| 672 | switch (fmt_spec) { |
| 673 | case 'i': fmt_spec = 'd'; break; |
| 674 | case 'D': fmt_spec = 'd'; length_modifier = 'l'; break; |
| 675 | case 'U': fmt_spec = 'u'; length_modifier = 'l'; break; |
| 676 | case 'O': fmt_spec = 'o'; length_modifier = 'l'; break; |
| 677 | default: break; |
| 678 | } |
| 679 | /* get parameter value, do initial processing */ |
| 680 | switch (fmt_spec) { |
| 681 | case '%': /* % behaves similar to 's' regarding flags and field widths */ |
| 682 | case 'c': /* c behaves similar to 's' regarding flags and field widths */ |
| 683 | case 's': |
| 684 | length_modifier = '\0'; /* wint_t and wchar_t not supported */ |
| 685 | /* the result of zero padding flag with non-numeric conversion specifier*/ |
| 686 | /* is undefined. Solaris and HPUX 10 does zero padding in this case, */ |
| 687 | /* Digital Unix and Linux does not. */ |
| 688 | #if !defined(SOLARIS_COMPATIBLE) && !defined(HPUX_COMPATIBLE) |
| 689 | zero_padding = 0; /* turn zero padding off for string conversions */ |
| 690 | #endif |
| 691 | str_arg_l = 1; |
| 692 | switch (fmt_spec) { |
| 693 | case '%': |
| 694 | str_arg = p; break; |
| 695 | case 'c': { |
| 696 | int j = va_arg(ap, int); |
| 697 | uchar_arg = (unsigned char) j; /* standard demands unsigned char */ |
| 698 | str_arg = (const char *) &uchar_arg; |
| 699 | break; |
| 700 | } |
| 701 | case 's': |
| 702 | str_arg = va_arg(ap, const char *); |
| 703 | if (!str_arg) str_arg_l = 0; |
| 704 | /* make sure not to address string beyond the specified precision !!! */ |
| 705 | else if (!precision_specified) str_arg_l = strlen(str_arg); |
| 706 | /* truncate string if necessary as requested by precision */ |
| 707 | else if (precision == 0) str_arg_l = 0; |
| 708 | else { |
| 709 | /* memchr on HP does not like n > 2^31 !!! */ |
| 710 | const char *q = memchr(str_arg, '\0', |
| 711 | precision <= 0x7fffffff ? precision : 0x7fffffff); |
| 712 | str_arg_l = !q ? precision : (q-str_arg); |
| 713 | } |
| 714 | break; |
| 715 | default: break; |
| 716 | } |
| 717 | break; |
| 718 | case 'd': case 'u': case 'o': case 'x': case 'X': case 'p': { |
| 719 | /* NOTE: the u, o, x, X and p conversion specifiers imply |
| 720 | the value is unsigned; d implies a signed value */ |
| 721 | |
| 722 | int arg_sign = 0; |
| 723 | /* 0 if numeric argument is zero (or if pointer is NULL for 'p'), |
| 724 | +1 if greater than zero (or nonzero for unsigned arguments), |
| 725 | -1 if negative (unsigned argument is never negative) */ |
| 726 | |
| 727 | int int_arg = 0; unsigned int uint_arg = 0; |
| 728 | /* only defined for length modifier h, or for no length modifiers */ |
| 729 | |
| 730 | long int long_arg = 0; unsigned long int ulong_arg = 0; |
| 731 | /* only defined for length modifier l */ |
| 732 | |
| 733 | void *ptr_arg = NULL; |
| 734 | /* pointer argument value -only defined for p conversion */ |
| 735 | |
| 736 | #ifdef SNPRINTF_LONGLONG_SUPPORT |
| 737 | long long int long_long_arg = 0; |
| 738 | unsigned long long int ulong_long_arg = 0; |
| 739 | /* only defined for length modifier ll */ |
| 740 | #endif |
| 741 | if (fmt_spec == 'p') { |
| 742 | /* HPUX 10: An l, h, ll or L before any other conversion character |
| 743 | * (other than d, i, u, o, x, or X) is ignored. |
| 744 | * Digital Unix: |
| 745 | * not specified, but seems to behave as HPUX does. |
| 746 | * Solaris: If an h, l, or L appears before any other conversion |
| 747 | * specifier (other than d, i, u, o, x, or X), the behavior |
| 748 | * is undefined. (Actually %hp converts only 16-bits of address |
| 749 | * and %llp treats address as 64-bit data which is incompatible |
| 750 | * with (void *) argument on a 32-bit system). |
| 751 | */ |
| 752 | #ifdef SOLARIS_COMPATIBLE |
| 753 | # ifdef SOLARIS_BUG_COMPATIBLE |
| 754 | /* keep length modifiers even if it represents 'll' */ |
| 755 | # else |
| 756 | if (length_modifier == '2') length_modifier = '\0'; |
| 757 | # endif |
| 758 | #else |
| 759 | length_modifier = '\0'; |
| 760 | #endif |
| 761 | ptr_arg = va_arg(ap, void *); |
| 762 | if (ptr_arg != NULL) arg_sign = 1; |
| 763 | } else if (fmt_spec == 'd') { /* signed */ |
| 764 | switch (length_modifier) { |
| 765 | case '\0': |
| 766 | case 'h': |
| 767 | /* It is non-portable to specify a second argument of char or short |
| 768 | * to va_arg, because arguments seen by the called function |
| 769 | * are not char or short. C converts char and short arguments |
| 770 | * to int before passing them to a function. |
| 771 | */ |
| 772 | int_arg = va_arg(ap, int); |
| 773 | if (int_arg > 0) arg_sign = 1; |
| 774 | else if (int_arg < 0) arg_sign = -1; |
| 775 | break; |
| 776 | case 'l': |
| 777 | long_arg = va_arg(ap, long int); |
| 778 | if (long_arg > 0) arg_sign = 1; |
| 779 | else if (long_arg < 0) arg_sign = -1; |
| 780 | break; |
| 781 | #ifdef SNPRINTF_LONGLONG_SUPPORT |
| 782 | case '2': |
| 783 | long_long_arg = va_arg(ap, long long int); |
| 784 | if (long_long_arg > 0) arg_sign = 1; |
| 785 | else if (long_long_arg < 0) arg_sign = -1; |
| 786 | break; |
| 787 | #endif |
| 788 | } |
| 789 | } else { /* unsigned */ |
| 790 | switch (length_modifier) { |
| 791 | case '\0': |
| 792 | case 'h': |
| 793 | uint_arg = va_arg(ap, unsigned int); |
| 794 | if (uint_arg) arg_sign = 1; |
| 795 | break; |
| 796 | case 'l': |
| 797 | ulong_arg = va_arg(ap, unsigned long int); |
| 798 | if (ulong_arg) arg_sign = 1; |
| 799 | break; |
| 800 | #ifdef SNPRINTF_LONGLONG_SUPPORT |
| 801 | case '2': |
| 802 | ulong_long_arg = va_arg(ap, unsigned long long int); |
| 803 | if (ulong_long_arg) arg_sign = 1; |
| 804 | break; |
| 805 | #endif |
| 806 | } |
| 807 | } |
| 808 | str_arg = tmp; str_arg_l = 0; |
| 809 | /* NOTE: |
| 810 | * For d, i, u, o, x, and X conversions, if precision is specified, |
| 811 | * the '0' flag should be ignored. This is so with Solaris 2.6, |
| 812 | * Digital UNIX 4.0, HPUX 10, Linux, FreeBSD, NetBSD; but not with Perl. |
| 813 | */ |
| 814 | #ifndef PERL_COMPATIBLE |
| 815 | if (precision_specified) zero_padding = 0; |
| 816 | #endif |
| 817 | if (fmt_spec == 'd') { |
| 818 | if (force_sign && arg_sign >= 0) |
| 819 | tmp[str_arg_l++] = space_for_positive ? ' ' : '+'; |
| 820 | /* leave negative numbers for sprintf to handle, |
| 821 | to avoid handling tricky cases like (short int)(-32768) */ |
| 822 | #ifdef LINUX_COMPATIBLE |
| 823 | } else if (fmt_spec == 'p' && force_sign && arg_sign > 0) { |
| 824 | tmp[str_arg_l++] = space_for_positive ? ' ' : '+'; |
| 825 | #endif |
| 826 | } else if (alternate_form) { |
| 827 | if (arg_sign != 0 && (fmt_spec == 'x' || fmt_spec == 'X') ) |
| 828 | { tmp[str_arg_l++] = '0'; tmp[str_arg_l++] = fmt_spec; } |
| 829 | /* alternate form should have no effect for p conversion, but ... */ |
| 830 | #ifdef HPUX_COMPATIBLE |
| 831 | else if (fmt_spec == 'p' |
| 832 | /* HPUX 10: for an alternate form of p conversion, |
| 833 | * a nonzero result is prefixed by 0x. */ |
| 834 | #ifndef HPUX_BUG_COMPATIBLE |
| 835 | /* Actually it uses 0x prefix even for a zero value. */ |
| 836 | && arg_sign != 0 |
| 837 | #endif |
| 838 | ) { tmp[str_arg_l++] = '0'; tmp[str_arg_l++] = 'x'; } |
| 839 | #endif |
| 840 | } |
| 841 | zero_padding_insertion_ind = str_arg_l; |
| 842 | if (!precision_specified) precision = 1; /* default precision is 1 */ |
| 843 | if (precision == 0 && arg_sign == 0 |
| 844 | #if defined(HPUX_BUG_COMPATIBLE) || defined(LINUX_COMPATIBLE) |
| 845 | && fmt_spec != 'p' |
| 846 | /* HPUX 10 man page claims: With conversion character p the result of |
| 847 | * converting a zero value with a precision of zero is a null string. |
| 848 | * Actually HP returns all zeroes, and Linux returns "(nil)". */ |
| 849 | #endif |
| 850 | ) { |
| 851 | /* converted to null string */ |
| 852 | /* When zero value is formatted with an explicit precision 0, |
| 853 | the resulting formatted string is empty (d, i, u, o, x, X, p). */ |
| 854 | } else { |
| 855 | char f[5]; int f_l = 0; |
| 856 | f[f_l++] = '%'; /* construct a simple format string for sprintf */ |
| 857 | if (!length_modifier) { } |
| 858 | else if (length_modifier=='2') { f[f_l++] = 'l'; f[f_l++] = 'l'; } |
| 859 | else f[f_l++] = length_modifier; |
| 860 | f[f_l++] = fmt_spec; f[f_l++] = '\0'; |
| 861 | if (fmt_spec == 'p') str_arg_l += sprintf(tmp+str_arg_l, f, ptr_arg); |
| 862 | else if (fmt_spec == 'd') { /* signed */ |
| 863 | switch (length_modifier) { |
| 864 | case '\0': |
| 865 | case 'h': str_arg_l+=sprintf(tmp+str_arg_l, f, int_arg); break; |
| 866 | case 'l': str_arg_l+=sprintf(tmp+str_arg_l, f, long_arg); break; |
| 867 | #ifdef SNPRINTF_LONGLONG_SUPPORT |
| 868 | case '2': str_arg_l+=sprintf(tmp+str_arg_l,f,long_long_arg); break; |
| 869 | #endif |
| 870 | } |
| 871 | } else { /* unsigned */ |
| 872 | switch (length_modifier) { |
| 873 | case '\0': |
| 874 | case 'h': str_arg_l+=sprintf(tmp+str_arg_l, f, uint_arg); break; |
| 875 | case 'l': str_arg_l+=sprintf(tmp+str_arg_l, f, ulong_arg); break; |
| 876 | #ifdef SNPRINTF_LONGLONG_SUPPORT |
| 877 | case '2': str_arg_l+=sprintf(tmp+str_arg_l,f,ulong_long_arg);break; |
| 878 | #endif |
| 879 | } |
| 880 | } |
| 881 | /* include the optional minus sign and possible "0x" |
| 882 | in the region before the zero padding insertion point */ |
| 883 | if (zero_padding_insertion_ind < str_arg_l && |
| 884 | tmp[zero_padding_insertion_ind] == '-') { |
| 885 | zero_padding_insertion_ind++; |
| 886 | } |
| 887 | if (zero_padding_insertion_ind+1 < str_arg_l && |
| 888 | tmp[zero_padding_insertion_ind] == '0' && |
| 889 | (tmp[zero_padding_insertion_ind+1] == 'x' || |
| 890 | tmp[zero_padding_insertion_ind+1] == 'X') ) { |
| 891 | zero_padding_insertion_ind += 2; |
| 892 | } |
| 893 | } |
| 894 | { size_t num_of_digits = str_arg_l - zero_padding_insertion_ind; |
| 895 | if (alternate_form && fmt_spec == 'o' |
| 896 | #ifdef HPUX_COMPATIBLE /* ("%#.o",0) -> "" */ |
| 897 | && (str_arg_l > 0) |
| 898 | #endif |
| 899 | #ifdef DIGITAL_UNIX_BUG_COMPATIBLE /* ("%#o",0) -> "00" */ |
| 900 | #else |
| 901 | /* unless zero is already the first character */ |
| 902 | && !(zero_padding_insertion_ind < str_arg_l |
| 903 | && tmp[zero_padding_insertion_ind] == '0') |
| 904 | #endif |
| 905 | ) { /* assure leading zero for alternate-form octal numbers */ |
| 906 | if (!precision_specified || precision < num_of_digits+1) { |
| 907 | /* precision is increased to force the first character to be zero, |
| 908 | except if a zero value is formatted with an explicit precision |
| 909 | of zero */ |
| 910 | precision = num_of_digits+1; precision_specified = 1; |
| 911 | } |
| 912 | } |
| 913 | /* zero padding to specified precision? */ |
| 914 | if (num_of_digits < precision) |
| 915 | number_of_zeros_to_pad = precision - num_of_digits; |
| 916 | } |
| 917 | /* zero padding to specified minimal field width? */ |
| 918 | if (!justify_left && zero_padding) { |
| 919 | int n = min_field_width - (str_arg_l+number_of_zeros_to_pad); |
| 920 | if (n > 0) number_of_zeros_to_pad += n; |
| 921 | } |
| 922 | break; |
| 923 | } |
| 924 | default: /* unrecognized conversion specifier, keep format string as-is*/ |
| 925 | zero_padding = 0; /* turn zero padding off for non-numeric convers. */ |
| 926 | #ifndef DIGITAL_UNIX_COMPATIBLE |
| 927 | justify_left = 1; min_field_width = 0; /* reset flags */ |
| 928 | #endif |
| 929 | #if defined(PERL_COMPATIBLE) || defined(LINUX_COMPATIBLE) |
| 930 | /* keep the entire format string unchanged */ |
| 931 | str_arg = starting_p; str_arg_l = p - starting_p; |
| 932 | /* well, not exactly so for Linux, which does something inbetween, |
| 933 | * and I don't feel an urge to imitate it: "%+++++hy" -> "%+y" */ |
| 934 | #else |
| 935 | /* discard the unrecognized conversion, just keep * |
| 936 | * the unrecognized conversion character */ |
| 937 | str_arg = p; str_arg_l = 0; |
| 938 | #endif |
| 939 | if (*p) str_arg_l++; /* include invalid conversion specifier unchanged |
| 940 | if not at end-of-string */ |
| 941 | break; |
| 942 | } |
| 943 | if (*p) p++; /* step over the just processed conversion specifier */ |
| 944 | /* insert padding to the left as requested by min_field_width; |
| 945 | this does not include the zero padding in case of numerical conversions*/ |
| 946 | if (!justify_left) { /* left padding with blank or zero */ |
| 947 | int n = min_field_width - (str_arg_l+number_of_zeros_to_pad); |
| 948 | if (n > 0) { |
| 949 | if (str_l < str_m) { |
| 950 | size_t avail = str_m-str_l; |
| 951 | fast_memset(str+str_l, (zero_padding?'0':' '), (n>avail?avail:n)); |
| 952 | } |
| 953 | str_l += n; |
| 954 | } |
| 955 | } |
| 956 | /* zero padding as requested by the precision or by the minimal field width |
| 957 | * for numeric conversions required? */ |
| 958 | if (number_of_zeros_to_pad <= 0) { |
| 959 | /* will not copy first part of numeric right now, * |
| 960 | * force it to be copied later in its entirety */ |
| 961 | zero_padding_insertion_ind = 0; |
| 962 | } else { |
| 963 | /* insert first part of numerics (sign or '0x') before zero padding */ |
| 964 | int n = zero_padding_insertion_ind; |
| 965 | if (n > 0) { |
| 966 | if (str_l < str_m) { |
| 967 | size_t avail = str_m-str_l; |
| 968 | fast_memcpy(str+str_l, str_arg, (n>avail?avail:n)); |
| 969 | } |
| 970 | str_l += n; |
| 971 | } |
| 972 | /* insert zero padding as requested by the precision or min field width */ |
| 973 | n = number_of_zeros_to_pad; |
| 974 | if (n > 0) { |
| 975 | if (str_l < str_m) { |
| 976 | size_t avail = str_m-str_l; |
| 977 | fast_memset(str+str_l, '0', (n>avail?avail:n)); |
| 978 | } |
| 979 | str_l += n; |
| 980 | } |
| 981 | } |
| 982 | /* insert formatted string |
| 983 | * (or as-is conversion specifier for unknown conversions) */ |
| 984 | { int n = str_arg_l - zero_padding_insertion_ind; |
| 985 | if (n > 0) { |
| 986 | if (str_l < str_m) { |
| 987 | size_t avail = str_m-str_l; |
| 988 | fast_memcpy(str+str_l, str_arg+zero_padding_insertion_ind, |
| 989 | (n>avail?avail:n)); |
| 990 | } |
| 991 | str_l += n; |
| 992 | } |
| 993 | } |
| 994 | /* insert right padding */ |
| 995 | if (justify_left) { /* right blank padding to the field width */ |
| 996 | int n = min_field_width - (str_arg_l+number_of_zeros_to_pad); |
| 997 | if (n > 0) { |
| 998 | if (str_l < str_m) { |
| 999 | size_t avail = str_m-str_l; |
| 1000 | fast_memset(str+str_l, ' ', (n>avail?avail:n)); |
| 1001 | } |
| 1002 | str_l += n; |
| 1003 | } |
| 1004 | } |
| 1005 | } |
| 1006 | } |
| 1007 | #if defined(NEED_SNPRINTF_ONLY) |
| 1008 | va_end(ap); |
| 1009 | #endif |
| 1010 | if (str_m > 0) { /* make sure the string is null-terminated |
| 1011 | even at the expense of overwriting the last character |
| 1012 | (shouldn't happen, but just in case) */ |
| 1013 | str[str_l <= str_m-1 ? str_l : str_m-1] = '\0'; |
| 1014 | } |
| 1015 | /* Return the number of characters formatted (excluding trailing null |
| 1016 | * character), that is, the number of characters that would have been |
| 1017 | * written to the buffer if it were large enough. |
| 1018 | * |
| 1019 | * The value of str_l should be returned, but str_l is of unsigned type |
| 1020 | * size_t, and snprintf is int, possibly leading to an undetected |
| 1021 | * integer overflow, resulting in a negative return value, which is illegal. |
| 1022 | * Both XSH5 and ISO C99 (at least the draft) are silent on this issue. |
| 1023 | * Should errno be set to EOVERFLOW and EOF returned in this case??? |
| 1024 | */ |
| 1025 | return (int) str_l; |
| 1026 | } |
| 1027 | #endif |