002eaee3 |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: dputf.c,v 1.1 1999/10/04 21:44:47 mdw Exp $ |
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 $ |
33 | * Revision 1.1 1999/10/04 21:44:47 mdw |
34 | * Move `dstr_putf' and `dstr_vputf' into a separate source file. |
35 | * |
36 | */ |
37 | |
38 | /*----- Header files ------------------------------------------------------*/ |
39 | |
40 | #include <ctype.h> |
41 | #include <float.h> |
42 | #include <math.h> |
43 | #include <stdarg.h> |
44 | #include <stdio.h> |
45 | #include <stdlib.h> |
46 | #include <string.h> |
47 | |
48 | #include "dstr.h" |
49 | |
50 | /*----- Tunable constants -------------------------------------------------*/ |
51 | |
52 | /* |
53 | * For each format specifier, at least @DSTR_PUTFSTEP@ bytes are ensured |
54 | * before writing the formatted result. |
55 | */ |
56 | |
57 | #define DSTR_PUTFSTEP 64 /* Buffer size for @putf@ */ |
58 | |
59 | /*----- Main code ---------------------------------------------------------*/ |
60 | |
61 | /* --- @dstr_vputf@ --- * |
62 | * |
63 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
64 | * @const char *p@ = pointer to @printf@-style format string |
65 | * @va_list ap@ = argument handle |
66 | * |
67 | * Returns: The number of characters written to the string. |
68 | * |
69 | * Use: As for @dstr_putf@, but may be used as a back-end to user- |
70 | * supplied functions with @printf@-style interfaces. |
71 | */ |
72 | |
73 | int dstr_vputf(dstr *d, const char *p, va_list ap) |
74 | { |
75 | const char *q = p; |
76 | size_t n = d->len; |
77 | size_t sz; |
78 | dstr dd = DSTR_INIT; |
79 | |
80 | while (*p) { |
81 | unsigned f; |
82 | int wd, prec; |
83 | |
84 | enum { |
85 | f_short = 1, |
86 | f_long = 2, |
87 | f_Long = 4, |
88 | f_wd = 8, |
89 | f_prec = 16 |
90 | }; |
91 | |
92 | /* --- Most stuff gets passed on through --- */ |
93 | |
94 | if (*p != '%') { |
95 | p++; |
96 | continue; |
97 | } |
98 | |
99 | /* --- Dump out what's between @q@ and @p@ --- */ |
100 | |
101 | DPUTM(d, q, p - q); |
102 | p++; |
103 | |
104 | /* --- Sort out the various silly flags and things --- */ |
105 | |
106 | DPUTC(&dd, '%'); |
107 | f = 0; |
108 | sz = DSTR_PUTFSTEP; |
109 | |
110 | for (;;) { |
111 | switch (*p) { |
112 | |
113 | /* --- Various simple flags --- */ |
114 | |
115 | case '+': |
116 | case '-': |
117 | case '#': |
118 | case '0': |
119 | goto putch; |
120 | case 'h': |
121 | f |= f_short; |
122 | goto putch; |
123 | case 'l': |
124 | f |= f_long; |
125 | goto putch; |
126 | case 'L': |
127 | f |= f_Long; |
128 | goto putch; |
129 | case 0: |
130 | goto finished; |
131 | |
132 | /* --- Field widths and precision specifiers --- */ |
133 | |
134 | { |
135 | int *ip; |
136 | |
137 | case '.': |
138 | DPUTC(&dd, '.'); |
139 | ip = ≺ |
140 | f |= f_prec; |
141 | goto getnum; |
142 | case '*': |
143 | ip = &wd; |
144 | f |= f_wd; |
145 | goto getnum; |
146 | default: |
147 | if (isdigit((unsigned char)*p)) { |
148 | f |= f_wd; |
149 | ip = &wd; |
150 | goto getnum; |
151 | } |
152 | DPUTC(d, *p); |
153 | goto formatted; |
154 | getnum: |
155 | *ip = 0; |
156 | if (*p == '*') { |
157 | *ip = va_arg(ap, int); |
158 | DENSURE(&dd, DSTR_PUTFSTEP); |
159 | dd.len += sprintf(dd.buf + dd.len, "%i", *ip); |
160 | } else { |
161 | *ip = *p - '0'; |
162 | DPUTC(&dd, *p); |
163 | p++; |
164 | while (isdigit((unsigned char)*p)) { |
165 | DPUTC(&dd, *p); |
166 | *ip = 10 * *ip + *p++ - '0'; |
167 | } |
168 | } |
169 | break; |
170 | } |
171 | |
172 | /* --- Output formatting --- */ |
173 | |
174 | case 'd': case 'i': case 'x': case 'X': case 'o': case 'u': |
175 | DPUTC(&dd, *p); |
176 | DPUTZ(&dd); |
177 | if ((f & f_prec) && prec + 16 > sz) |
178 | sz = prec + 16; |
179 | if ((f & f_wd) && wd + 1> sz) |
180 | sz = wd + 1; |
181 | DENSURE(d, sz); |
182 | if (f & f_long) |
183 | d->len += sprintf(d->buf + d->len, dd.buf, |
184 | va_arg(ap, unsigned long)); |
185 | else |
186 | d->len += sprintf(d->buf + d->len, dd.buf, |
187 | va_arg(ap, unsigned int)); |
188 | goto formatted; |
189 | |
190 | case 'e': case 'E': case 'f': case 'F': case 'g': case 'G': |
191 | DPUTC(&dd, *p); |
192 | DPUTZ(&dd); |
193 | if (*p == 'f') { |
194 | size_t mx = (f & f_Long ? LDBL_MAX_10_EXP : DBL_MAX_10_EXP) + 16; |
195 | if (mx > sz) |
196 | sz = mx; |
197 | } |
198 | if ((f & f_prec) == 0) |
199 | prec = 6; |
200 | if ((f & f_prec)) |
201 | sz += prec + 16; |
202 | if ((f & f_wd) && wd + 1 > sz) |
203 | sz = wd + 1; |
204 | DENSURE(d, sz); |
205 | if (f & f_Long) |
206 | d->len += sprintf(d->buf + d->len, dd.buf, |
207 | va_arg(ap, long double)); |
208 | else |
209 | d->len += sprintf(d->buf + d->len, dd.buf, |
210 | va_arg(ap, double)); |
211 | goto formatted; |
212 | |
213 | case 'c': |
214 | DPUTC(&dd, *p); |
215 | DPUTZ(&dd); |
216 | if ((f & f_wd) && wd + 1> sz) |
217 | sz = wd + 1; |
218 | DENSURE(d, sz); |
219 | d->len += sprintf(d->buf + d->len, dd.buf, |
220 | va_arg(ap, unsigned char)); |
221 | goto formatted; |
222 | |
223 | case 's': { |
224 | const char *s = va_arg(ap, const char *); |
225 | sz = strlen(s); |
226 | DPUTC(&dd, *p); |
227 | DPUTZ(&dd); |
228 | if (f & f_prec) |
229 | sz = prec; |
230 | if ((f & f_wd) && wd > sz) |
231 | sz = wd; |
232 | DENSURE(d, sz + 1); |
233 | d->len += sprintf(d->buf + d->len, dd.buf, s); |
234 | goto formatted; |
235 | } |
236 | |
237 | case 'p': |
238 | DPUTC(&dd, *p); |
239 | DPUTZ(&dd); |
240 | if ((f & f_prec) && prec + 16 > sz) |
241 | sz = prec + 16; |
242 | if ((f & f_wd) && wd + 1> sz) |
243 | sz = wd + 1; |
244 | DENSURE(d, sz); |
245 | d->len += sprintf(d->buf + d->len, dd.buf, |
246 | va_arg(ap, const void *)); |
247 | goto formatted; |
248 | |
249 | case 'n': |
250 | if (f & f_long) |
251 | *va_arg(ap, long *) = (long)(d->len - n); |
252 | else if (f & f_short) |
253 | *va_arg(ap, short *) = (short)(d->len - n); |
254 | else |
255 | *va_arg(ap, int *) = (int)(d->len - n); |
256 | goto formatted; |
257 | |
258 | /* --- Other random stuff --- */ |
259 | |
260 | putch: |
261 | DPUTC(&dd, *p); |
262 | p++; |
263 | break; |
264 | } |
265 | } |
266 | |
267 | formatted: |
268 | DRESET(&dd); |
269 | q = ++p; |
270 | } |
271 | |
272 | DPUTM(d, q, p - q); |
273 | finished: |
274 | DPUTZ(d); |
275 | DDESTROY(&dd); |
276 | return (d->len - n); |
277 | } |
278 | |
279 | /* --- @dstr_putf@ --- * |
280 | * |
281 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
282 | * @const char *p@ = pointer to @printf@-style format string |
283 | * @...@ = argument handle |
284 | * |
285 | * Returns: The number of characters written to the string. |
286 | * |
287 | * Use: Writes a piece of text to a dynamic string, doing @printf@- |
288 | * style substitutions as it goes. Intended to be robust if |
289 | * faced with malicious arguments, but not if the format string |
290 | * itself is malicious. |
291 | */ |
292 | |
293 | int dstr_putf(dstr *d, const char *p, ...) |
294 | { |
295 | int n; |
296 | va_list ap; |
297 | va_start(ap, p); |
298 | n = dstr_vputf(d, p, ap); |
299 | va_end(ap); |
300 | return (n); |
301 | } |
302 | |
303 | /*----- That's all, folks -------------------------------------------------*/ |