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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: dputf.c,v 1.2 2000/08/15 21:26:45 mdw Exp $ |
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4 | * |
5 | * `printf'-style formatting for dynamic strings |
6 | * |
7 | * (c) 1999 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
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. |
18 | * |
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. |
23 | * |
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 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: dputf.c,v $ |
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33 | * Revision 1.2 2000/08/15 21:26:45 mdw |
34 | * (dstr_vputf): Don't try calling @va_arg@ on things @char@-sized. |
35 | * |
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36 | * Revision 1.1 1999/10/04 21:44:47 mdw |
37 | * Move `dstr_putf' and `dstr_vputf' into a separate source file. |
38 | * |
39 | */ |
40 | |
41 | /*----- Header files ------------------------------------------------------*/ |
42 | |
43 | #include <ctype.h> |
44 | #include <float.h> |
45 | #include <math.h> |
46 | #include <stdarg.h> |
47 | #include <stdio.h> |
48 | #include <stdlib.h> |
49 | #include <string.h> |
50 | |
51 | #include "dstr.h" |
52 | |
53 | /*----- Tunable constants -------------------------------------------------*/ |
54 | |
55 | /* |
56 | * For each format specifier, at least @DSTR_PUTFSTEP@ bytes are ensured |
57 | * before writing the formatted result. |
58 | */ |
59 | |
60 | #define DSTR_PUTFSTEP 64 /* Buffer size for @putf@ */ |
61 | |
62 | /*----- Main code ---------------------------------------------------------*/ |
63 | |
64 | /* --- @dstr_vputf@ --- * |
65 | * |
66 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
67 | * @const char *p@ = pointer to @printf@-style format string |
68 | * @va_list ap@ = argument handle |
69 | * |
70 | * Returns: The number of characters written to the string. |
71 | * |
72 | * Use: As for @dstr_putf@, but may be used as a back-end to user- |
73 | * supplied functions with @printf@-style interfaces. |
74 | */ |
75 | |
76 | int dstr_vputf(dstr *d, const char *p, va_list ap) |
77 | { |
78 | const char *q = p; |
79 | size_t n = d->len; |
80 | size_t sz; |
81 | dstr dd = DSTR_INIT; |
82 | |
83 | while (*p) { |
84 | unsigned f; |
85 | int wd, prec; |
86 | |
87 | enum { |
88 | f_short = 1, |
89 | f_long = 2, |
90 | f_Long = 4, |
91 | f_wd = 8, |
92 | f_prec = 16 |
93 | }; |
94 | |
95 | /* --- Most stuff gets passed on through --- */ |
96 | |
97 | if (*p != '%') { |
98 | p++; |
99 | continue; |
100 | } |
101 | |
102 | /* --- Dump out what's between @q@ and @p@ --- */ |
103 | |
104 | DPUTM(d, q, p - q); |
105 | p++; |
106 | |
107 | /* --- Sort out the various silly flags and things --- */ |
108 | |
109 | DPUTC(&dd, '%'); |
110 | f = 0; |
111 | sz = DSTR_PUTFSTEP; |
112 | |
113 | for (;;) { |
114 | switch (*p) { |
115 | |
116 | /* --- Various simple flags --- */ |
117 | |
118 | case '+': |
119 | case '-': |
120 | case '#': |
121 | case '0': |
122 | goto putch; |
123 | case 'h': |
124 | f |= f_short; |
125 | goto putch; |
126 | case 'l': |
127 | f |= f_long; |
128 | goto putch; |
129 | case 'L': |
130 | f |= f_Long; |
131 | goto putch; |
132 | case 0: |
133 | goto finished; |
134 | |
135 | /* --- Field widths and precision specifiers --- */ |
136 | |
137 | { |
138 | int *ip; |
139 | |
140 | case '.': |
141 | DPUTC(&dd, '.'); |
142 | ip = ≺ |
143 | f |= f_prec; |
144 | goto getnum; |
145 | case '*': |
146 | ip = &wd; |
147 | f |= f_wd; |
148 | goto getnum; |
149 | default: |
150 | if (isdigit((unsigned char)*p)) { |
151 | f |= f_wd; |
152 | ip = &wd; |
153 | goto getnum; |
154 | } |
155 | DPUTC(d, *p); |
156 | goto formatted; |
157 | getnum: |
158 | *ip = 0; |
159 | if (*p == '*') { |
160 | *ip = va_arg(ap, int); |
161 | DENSURE(&dd, DSTR_PUTFSTEP); |
162 | dd.len += sprintf(dd.buf + dd.len, "%i", *ip); |
163 | } else { |
164 | *ip = *p - '0'; |
165 | DPUTC(&dd, *p); |
166 | p++; |
167 | while (isdigit((unsigned char)*p)) { |
168 | DPUTC(&dd, *p); |
169 | *ip = 10 * *ip + *p++ - '0'; |
170 | } |
171 | } |
172 | break; |
173 | } |
174 | |
175 | /* --- Output formatting --- */ |
176 | |
177 | case 'd': case 'i': case 'x': case 'X': case 'o': case 'u': |
178 | DPUTC(&dd, *p); |
179 | DPUTZ(&dd); |
180 | if ((f & f_prec) && prec + 16 > sz) |
181 | sz = prec + 16; |
182 | if ((f & f_wd) && wd + 1> sz) |
183 | sz = wd + 1; |
184 | DENSURE(d, sz); |
185 | if (f & f_long) |
186 | d->len += sprintf(d->buf + d->len, dd.buf, |
187 | va_arg(ap, unsigned long)); |
188 | else |
189 | d->len += sprintf(d->buf + d->len, dd.buf, |
190 | va_arg(ap, unsigned int)); |
191 | goto formatted; |
192 | |
193 | case 'e': case 'E': case 'f': case 'F': case 'g': case 'G': |
194 | DPUTC(&dd, *p); |
195 | DPUTZ(&dd); |
196 | if (*p == 'f') { |
197 | size_t mx = (f & f_Long ? LDBL_MAX_10_EXP : DBL_MAX_10_EXP) + 16; |
198 | if (mx > sz) |
199 | sz = mx; |
200 | } |
201 | if ((f & f_prec) == 0) |
202 | prec = 6; |
203 | if ((f & f_prec)) |
204 | sz += prec + 16; |
205 | if ((f & f_wd) && wd + 1 > sz) |
206 | sz = wd + 1; |
207 | DENSURE(d, sz); |
208 | if (f & f_Long) |
209 | d->len += sprintf(d->buf + d->len, dd.buf, |
210 | va_arg(ap, long double)); |
211 | else |
212 | d->len += sprintf(d->buf + d->len, dd.buf, |
213 | va_arg(ap, double)); |
214 | goto formatted; |
215 | |
216 | case 'c': |
217 | DPUTC(&dd, *p); |
218 | DPUTZ(&dd); |
219 | if ((f & f_wd) && wd + 1> sz) |
220 | sz = wd + 1; |
221 | DENSURE(d, sz); |
222 | d->len += sprintf(d->buf + d->len, dd.buf, |
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223 | va_arg(ap, unsigned)); |
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224 | goto formatted; |
225 | |
226 | case 's': { |
227 | const char *s = va_arg(ap, const char *); |
228 | sz = strlen(s); |
229 | DPUTC(&dd, *p); |
230 | DPUTZ(&dd); |
231 | if (f & f_prec) |
232 | sz = prec; |
233 | if ((f & f_wd) && wd > sz) |
234 | sz = wd; |
235 | DENSURE(d, sz + 1); |
236 | d->len += sprintf(d->buf + d->len, dd.buf, s); |
237 | goto formatted; |
238 | } |
239 | |
240 | case 'p': |
241 | DPUTC(&dd, *p); |
242 | DPUTZ(&dd); |
243 | if ((f & f_prec) && prec + 16 > sz) |
244 | sz = prec + 16; |
245 | if ((f & f_wd) && wd + 1> sz) |
246 | sz = wd + 1; |
247 | DENSURE(d, sz); |
248 | d->len += sprintf(d->buf + d->len, dd.buf, |
249 | va_arg(ap, const void *)); |
250 | goto formatted; |
251 | |
252 | case 'n': |
253 | if (f & f_long) |
254 | *va_arg(ap, long *) = (long)(d->len - n); |
255 | else if (f & f_short) |
256 | *va_arg(ap, short *) = (short)(d->len - n); |
257 | else |
258 | *va_arg(ap, int *) = (int)(d->len - n); |
259 | goto formatted; |
260 | |
261 | /* --- Other random stuff --- */ |
262 | |
263 | putch: |
264 | DPUTC(&dd, *p); |
265 | p++; |
266 | break; |
267 | } |
268 | } |
269 | |
270 | formatted: |
271 | DRESET(&dd); |
272 | q = ++p; |
273 | } |
274 | |
275 | DPUTM(d, q, p - q); |
276 | finished: |
277 | DPUTZ(d); |
278 | DDESTROY(&dd); |
279 | return (d->len - n); |
280 | } |
281 | |
282 | /* --- @dstr_putf@ --- * |
283 | * |
284 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
285 | * @const char *p@ = pointer to @printf@-style format string |
286 | * @...@ = argument handle |
287 | * |
288 | * Returns: The number of characters written to the string. |
289 | * |
290 | * Use: Writes a piece of text to a dynamic string, doing @printf@- |
291 | * style substitutions as it goes. Intended to be robust if |
292 | * faced with malicious arguments, but not if the format string |
293 | * itself is malicious. |
294 | */ |
295 | |
296 | int dstr_putf(dstr *d, const char *p, ...) |
297 | { |
298 | int n; |
299 | va_list ap; |
300 | va_start(ap, p); |
301 | n = dstr_vputf(d, p, ap); |
302 | va_end(ap); |
303 | return (n); |
304 | } |
305 | |
306 | /*----- That's all, folks -------------------------------------------------*/ |