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1 | /* -*-c-*- |
2 | * |
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3 | * $Id$ |
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4 | * |
5 | * `printf'-style formatting for dynamic strings |
6 | * |
7 | * (c) 1999 Straylight/Edgeware |
8 | */ |
9 | |
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10 | /*----- Licensing notice --------------------------------------------------* |
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11 | * |
12 | * This file is part of the mLib utilities library. |
13 | * |
14 | * mLib is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
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18 | * |
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19 | * mLib is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU Library General Public License for more details. |
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23 | * |
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24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with mLib; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
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30 | /*----- Header files ------------------------------------------------------*/ |
31 | |
32 | #include <ctype.h> |
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33 | #include <math.h> |
34 | #include <stdarg.h> |
35 | #include <stdio.h> |
36 | #include <stdlib.h> |
37 | #include <string.h> |
38 | |
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39 | #ifdef HAVE_FLOAT_H |
40 | # include <float.h> |
41 | #endif |
42 | |
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43 | #include "dstr.h" |
44 | |
45 | /*----- Tunable constants -------------------------------------------------*/ |
46 | |
47 | /* |
48 | * For each format specifier, at least @DSTR_PUTFSTEP@ bytes are ensured |
49 | * before writing the formatted result. |
50 | */ |
51 | |
52 | #define DSTR_PUTFSTEP 64 /* Buffer size for @putf@ */ |
53 | |
54 | /*----- Main code ---------------------------------------------------------*/ |
55 | |
56 | /* --- @dstr_vputf@ --- * |
57 | * |
58 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
59 | * @const char *p@ = pointer to @printf@-style format string |
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60 | * @va_list *ap@ = argument handle |
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61 | * |
62 | * Returns: The number of characters written to the string. |
63 | * |
64 | * Use: As for @dstr_putf@, but may be used as a back-end to user- |
65 | * supplied functions with @printf@-style interfaces. |
66 | */ |
67 | |
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68 | int dstr_vputf(dstr *d, const char *p, va_list *ap) |
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69 | { |
70 | const char *q = p; |
71 | size_t n = d->len; |
72 | size_t sz; |
73 | dstr dd = DSTR_INIT; |
74 | |
75 | while (*p) { |
76 | unsigned f; |
77 | int wd, prec; |
78 | |
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79 | #define f_short 1u |
80 | #define f_long 2u |
81 | #define f_Long 4u |
82 | #define f_wd 8u |
83 | #define f_prec 16u |
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84 | |
85 | /* --- Most stuff gets passed on through --- */ |
86 | |
87 | if (*p != '%') { |
88 | p++; |
89 | continue; |
90 | } |
91 | |
92 | /* --- Dump out what's between @q@ and @p@ --- */ |
93 | |
94 | DPUTM(d, q, p - q); |
95 | p++; |
96 | |
97 | /* --- Sort out the various silly flags and things --- */ |
98 | |
99 | DPUTC(&dd, '%'); |
100 | f = 0; |
101 | sz = DSTR_PUTFSTEP; |
102 | |
103 | for (;;) { |
104 | switch (*p) { |
105 | |
106 | /* --- Various simple flags --- */ |
107 | |
108 | case '+': |
109 | case '-': |
110 | case '#': |
111 | case '0': |
112 | goto putch; |
113 | case 'h': |
114 | f |= f_short; |
115 | goto putch; |
116 | case 'l': |
117 | f |= f_long; |
118 | goto putch; |
119 | case 'L': |
120 | f |= f_Long; |
121 | goto putch; |
122 | case 0: |
123 | goto finished; |
124 | |
125 | /* --- Field widths and precision specifiers --- */ |
126 | |
127 | { |
128 | int *ip; |
129 | |
130 | case '.': |
131 | DPUTC(&dd, '.'); |
132 | ip = ≺ |
133 | f |= f_prec; |
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134 | p++; |
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135 | goto getnum; |
136 | case '*': |
137 | ip = &wd; |
138 | f |= f_wd; |
139 | goto getnum; |
140 | default: |
141 | if (isdigit((unsigned char)*p)) { |
142 | f |= f_wd; |
143 | ip = &wd; |
144 | goto getnum; |
145 | } |
146 | DPUTC(d, *p); |
147 | goto formatted; |
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148 | getnum: |
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149 | *ip = 0; |
150 | if (*p == '*') { |
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151 | *ip = va_arg(*ap, int); |
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152 | DENSURE(&dd, DSTR_PUTFSTEP); |
153 | dd.len += sprintf(dd.buf + dd.len, "%i", *ip); |
154 | } else { |
155 | *ip = *p - '0'; |
156 | DPUTC(&dd, *p); |
157 | p++; |
158 | while (isdigit((unsigned char)*p)) { |
159 | DPUTC(&dd, *p); |
160 | *ip = 10 * *ip + *p++ - '0'; |
161 | } |
162 | } |
163 | break; |
164 | } |
165 | |
166 | /* --- Output formatting --- */ |
167 | |
168 | case 'd': case 'i': case 'x': case 'X': case 'o': case 'u': |
169 | DPUTC(&dd, *p); |
170 | DPUTZ(&dd); |
171 | if ((f & f_prec) && prec + 16 > sz) |
172 | sz = prec + 16; |
173 | if ((f & f_wd) && wd + 1> sz) |
174 | sz = wd + 1; |
175 | DENSURE(d, sz); |
176 | if (f & f_long) |
177 | d->len += sprintf(d->buf + d->len, dd.buf, |
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178 | va_arg(*ap, unsigned long)); |
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179 | else |
180 | d->len += sprintf(d->buf + d->len, dd.buf, |
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181 | va_arg(*ap, unsigned int)); |
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182 | goto formatted; |
183 | |
184 | case 'e': case 'E': case 'f': case 'F': case 'g': case 'G': |
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185 | #ifdef HAVE_FLOAT_H |
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186 | DPUTC(&dd, *p); |
187 | DPUTZ(&dd); |
188 | if (*p == 'f') { |
189 | size_t mx = (f & f_Long ? LDBL_MAX_10_EXP : DBL_MAX_10_EXP) + 16; |
190 | if (mx > sz) |
191 | sz = mx; |
192 | } |
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193 | if (!(f & f_prec)) |
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194 | prec = 6; |
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195 | else |
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196 | sz += prec + 16; |
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197 | if ((f & f_wd) && wd + 1 > sz) |
198 | sz = wd + 1; |
199 | DENSURE(d, sz); |
200 | if (f & f_Long) |
201 | d->len += sprintf(d->buf + d->len, dd.buf, |
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202 | va_arg(*ap, long double)); |
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203 | else |
204 | d->len += sprintf(d->buf + d->len, dd.buf, |
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205 | va_arg(*ap, double)); |
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206 | goto formatted; |
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207 | #else |
208 | DPUTS(d, "<no float support>"); |
209 | #endif |
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210 | |
211 | case 'c': |
212 | DPUTC(&dd, *p); |
213 | DPUTZ(&dd); |
214 | if ((f & f_wd) && wd + 1> sz) |
215 | sz = wd + 1; |
216 | DENSURE(d, sz); |
217 | d->len += sprintf(d->buf + d->len, dd.buf, |
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218 | va_arg(*ap, unsigned)); |
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219 | goto formatted; |
220 | |
221 | case 's': { |
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222 | const char *s = va_arg(*ap, const char *); |
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223 | sz = strlen(s); |
224 | DPUTC(&dd, *p); |
225 | DPUTZ(&dd); |
226 | if (f & f_prec) |
227 | sz = prec; |
228 | if ((f & f_wd) && wd > sz) |
229 | sz = wd; |
230 | DENSURE(d, sz + 1); |
231 | d->len += sprintf(d->buf + d->len, dd.buf, s); |
232 | goto formatted; |
233 | } |
234 | |
235 | case 'p': |
236 | DPUTC(&dd, *p); |
237 | DPUTZ(&dd); |
238 | if ((f & f_prec) && prec + 16 > sz) |
239 | sz = prec + 16; |
240 | if ((f & f_wd) && wd + 1> sz) |
241 | sz = wd + 1; |
242 | DENSURE(d, sz); |
243 | d->len += sprintf(d->buf + d->len, dd.buf, |
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244 | va_arg(*ap, const void *)); |
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245 | goto formatted; |
246 | |
247 | case 'n': |
248 | if (f & f_long) |
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249 | *va_arg(*ap, long *) = (long)(d->len - n); |
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250 | else if (f & f_short) |
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251 | *va_arg(*ap, short *) = (short)(d->len - n); |
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252 | else |
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253 | *va_arg(*ap, int *) = (int)(d->len - n); |
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254 | goto formatted; |
255 | |
256 | /* --- Other random stuff --- */ |
257 | |
258 | putch: |
259 | DPUTC(&dd, *p); |
260 | p++; |
261 | break; |
262 | } |
263 | } |
264 | |
265 | formatted: |
266 | DRESET(&dd); |
267 | q = ++p; |
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268 | |
269 | #undef f_short |
270 | #undef f_long |
271 | #undef f_Long |
272 | #undef f_wd |
273 | #undef f_prec |
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274 | } |
275 | |
276 | DPUTM(d, q, p - q); |
277 | finished: |
278 | DPUTZ(d); |
279 | DDESTROY(&dd); |
280 | return (d->len - n); |
281 | } |
282 | |
283 | /* --- @dstr_putf@ --- * |
284 | * |
285 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
286 | * @const char *p@ = pointer to @printf@-style format string |
287 | * @...@ = argument handle |
288 | * |
289 | * Returns: The number of characters written to the string. |
290 | * |
291 | * Use: Writes a piece of text to a dynamic string, doing @printf@- |
292 | * style substitutions as it goes. Intended to be robust if |
293 | * faced with malicious arguments, but not if the format string |
294 | * itself is malicious. |
295 | */ |
296 | |
297 | int dstr_putf(dstr *d, const char *p, ...) |
298 | { |
299 | int n; |
300 | va_list ap; |
301 | va_start(ap, p); |
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302 | n = dstr_vputf(d, p, &ap); |
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303 | va_end(ap); |
304 | return (n); |
305 | } |
306 | |
307 | /*----- That's all, folks -------------------------------------------------*/ |