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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: dstr.c,v 1.15 2000/07/16 12:29:16 mdw Exp $ |
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4 | * |
5 | * Handle dynamically growing strings |
6 | * |
7 | * (c) 1998 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 |
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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 | * |
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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 |
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22 | * GNU Library General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Library General Public |
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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. |
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28 | */ |
29 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: dstr.c,v $ |
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33 | * Revision 1.15 2000/07/16 12:29:16 mdw |
34 | * Change to arena `realloc' interface, to fix a design bug. |
35 | * |
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36 | * Revision 1.14 2000/06/17 10:37:39 mdw |
37 | * Add support for arena management. |
38 | * |
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39 | * Revision 1.13 1999/12/22 15:39:28 mdw |
40 | * Fix overflow in dstr_putline. |
41 | * |
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42 | * Revision 1.12 1999/12/10 23:42:04 mdw |
43 | * Change header file guard names. |
44 | * |
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45 | * Revision 1.11 1999/10/28 22:05:29 mdw |
46 | * Modify and debug allocation routines. |
47 | * |
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48 | * Revision 1.10 1999/10/04 21:44:47 mdw |
49 | * Move `dstr_putf' and `dstr_vputf' into a separate source file. |
50 | * |
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51 | * Revision 1.9 1999/07/06 19:16:06 mdw |
52 | * Simplify buffer-growing algorithm. Just double it each time. |
53 | * |
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54 | * Revision 1.8 1999/06/01 09:47:52 mdw |
55 | * Fix nasty bugs in `dstr_vputf'. |
56 | * |
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57 | * Revision 1.7 1999/05/21 22:14:30 mdw |
58 | * Take advantage of the new dynamic string macros. |
59 | * |
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60 | * Revision 1.6 1999/05/21 08:38:33 mdw |
61 | * Implement some more functions in terms of macros. |
62 | * |
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63 | * Revision 1.5 1999/05/13 22:47:57 mdw |
64 | * Misc documentation fixes. Change `-ise' to `-ize' throughout. |
65 | * |
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66 | * Revision 1.4 1999/05/06 19:51:35 mdw |
67 | * Reformatted the LGPL notice a little bit. |
68 | * |
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69 | * Revision 1.3 1999/05/05 18:50:31 mdw |
70 | * Change licensing conditions to LGPL. |
71 | * |
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72 | * Revision 1.2 1998/12/15 23:53:22 mdw |
73 | * New functions `dstr_putf' and `dstr_vputf' which do `printf'-style |
74 | * formatting in a safe way. |
75 | * |
76 | * Revision 1.1.1.1 1998/06/17 23:44:42 mdw |
77 | * Initial version of mLib |
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78 | * |
79 | */ |
80 | |
81 | /*----- Header files ------------------------------------------------------*/ |
82 | |
83 | #include <stdio.h> |
84 | #include <stdlib.h> |
85 | #include <string.h> |
86 | |
87 | #include "alloc.h" |
88 | #include "dstr.h" |
89 | |
90 | /*----- Tunable constants -------------------------------------------------*/ |
91 | |
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92 | /* |
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93 | * If the buffer is empty, it is set to @DSTR_INITSZ@ bytes in size. |
94 | * Otherwise, it's set to the next power of two that's large enough. This is |
95 | * memory-hungry, but efficient. |
96 | */ |
97 | |
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98 | #define DSTR_INITSZ 64 /* Initial buffer size */ |
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99 | |
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100 | /*----- Main code ---------------------------------------------------------*/ |
101 | |
102 | /* --- @dstr_create@ --- * |
103 | * |
104 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
105 | * |
106 | * Returns: --- |
107 | * |
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108 | * Use: Initializes a dynamic string. |
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109 | */ |
110 | |
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111 | void dstr_create(dstr *d) { DCREATE(d); } |
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112 | |
113 | /* --- @dstr_destroy@ --- * |
114 | * |
115 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
116 | * |
117 | * Returns: --- |
118 | * |
119 | * Use: Reclaims the space used by a dynamic string. |
120 | */ |
121 | |
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122 | void dstr_destroy(dstr *d) { DDESTROY(d); } |
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123 | |
124 | /* --- @dstr_reset@ --- * |
125 | * |
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126 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
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127 | * |
128 | * Returns: --- |
129 | * |
130 | * Use: Resets a string so that new data gets put at the beginning. |
131 | */ |
132 | |
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133 | void dstr_reset(dstr *d) { DRESET(d); } |
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134 | |
135 | /* --- @dstr_ensure@ --- * |
136 | * |
137 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
138 | * @size_t sz@ = amount of free space to ensure |
139 | * |
140 | * Returns: --- |
141 | * |
142 | * Use: Ensures that at least @sz@ bytes are available in the |
143 | * given string. |
144 | */ |
145 | |
146 | void dstr_ensure(dstr *d, size_t sz) |
147 | { |
148 | size_t rq = d->len + sz; |
149 | size_t nsz; |
150 | |
151 | /* --- If we have enough space, just leave it --- */ |
152 | |
153 | if (rq <= d->sz) |
154 | return; |
155 | |
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156 | /* --- Grow the buffer --- */ |
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157 | |
158 | nsz = d->sz; |
159 | |
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160 | if (nsz == 0) |
161 | nsz = (DSTR_INITSZ >> 1); |
162 | do nsz <<= 1; while (nsz < rq); |
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163 | |
164 | if (d->buf) |
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165 | d->buf = x_realloc(d->a, d->buf, nsz, d->sz); |
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166 | else |
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167 | d->buf = x_alloc(d->a, nsz); |
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168 | d->sz = nsz; |
169 | } |
170 | |
171 | /* --- @dstr_putc@ --- * |
172 | * |
173 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
174 | * @char ch@ = character to append |
175 | * |
176 | * Returns: --- |
177 | * |
178 | * Use: Appends a character to a string. |
179 | */ |
180 | |
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181 | void dstr_putc(dstr *d, char ch) { DPUTC(d, ch); } |
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182 | |
183 | /* --- @dstr_putz@ --- * |
184 | * |
185 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
186 | * |
187 | * Returns: --- |
188 | * |
189 | * Use: Appends a null byte to a string. The null byte does not |
190 | * contribute to the string's length, and will be overwritten |
191 | * by subsequent `put' operations. |
192 | */ |
193 | |
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194 | void dstr_putz(dstr *d) { DPUTZ(d); } |
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195 | |
196 | /* --- @dstr_puts@ --- * |
197 | * |
198 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
199 | * @const char *s@ = pointer to string to append |
200 | * |
201 | * Returns: --- |
202 | * |
203 | * Use: Appends a character string to a string. A trailing null |
204 | * byte is added, as for @dstr_putz@. |
205 | */ |
206 | |
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207 | void dstr_puts(dstr *d, const char *s) { DPUTS(d, s); } |
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208 | |
209 | /* --- @dstr_putd@ --- * |
210 | * |
211 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
212 | * @const dstr *s@ = pointer to a dynamic string to append |
213 | * |
214 | * Returns: --- |
215 | * |
216 | * Use: Appends a dynamic string to a string. A trailing null |
217 | * byte is added, as for @dstr_putz@. |
218 | */ |
219 | |
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220 | void dstr_putd(dstr *d, const dstr *s) { DPUTD(d, s); } |
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221 | |
222 | /* --- @dstr_putm@ --- * |
223 | * |
224 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
225 | * @const void *p@ = pointer to a block to append |
226 | * @size_t sz@ = size of the block |
227 | * |
228 | * Returns: Appends an arbitrary data block to a string. No trailing |
229 | * null is appended. |
230 | */ |
231 | |
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232 | void dstr_putm(dstr *d, const void *p, size_t sz) { DPUTM(d, p, sz); } |
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233 | |
234 | /* --- @dstr_tidy@ --- * |
235 | * |
236 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
237 | * |
238 | * Returns: --- |
239 | * |
240 | * Use: Reduces the amount of memory used by a string. A trailing |
241 | * null byte is added, as for @dstr_putz@. |
242 | */ |
243 | |
244 | void dstr_tidy(dstr *d) |
245 | { |
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246 | d->buf = x_realloc(d->a, d->buf, d->len + 1, d->sz); |
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247 | d->buf[d->len] = 0; |
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248 | d->sz = d->len + 1; |
249 | } |
250 | |
251 | /* --- @dstr_putline@ --- * |
252 | * |
253 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
254 | * @FILE *fp@ = a stream to read from |
255 | * |
256 | * Returns: The number of characters read into the buffer, or @EOF@ if |
257 | * end-of-file was reached before any characters were read. |
258 | * |
259 | * Use: Appends the next line from the given input stream to the |
260 | * string. A trailing newline is not added; a trailing null |
261 | * byte is appended, as for @dstr_putz@. |
262 | */ |
263 | |
264 | int dstr_putline(dstr *d, FILE *fp) |
265 | { |
266 | size_t left = d->sz - d->len; |
267 | size_t off = d->len; |
268 | int rd = 0; |
269 | int ch; |
270 | |
271 | for (;;) { |
272 | |
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273 | /* --- Read the next byte --- */ |
274 | |
275 | ch = getc(fp); |
276 | |
277 | /* --- End-of-file when no characters read is special --- */ |
278 | |
279 | if (ch == EOF && !rd) |
280 | return (EOF); |
281 | |
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282 | /* --- Make sure there's some buffer space --- */ |
283 | |
284 | if (!left) { |
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285 | d->len = off; |
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286 | dstr_ensure(d, 1); |
287 | left = d->sz - off; |
288 | } |
289 | |
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290 | /* --- End-of-file or newline ends the loop --- */ |
291 | |
292 | if (ch == EOF || ch == '\n') { |
293 | d->buf[off] = 0; |
294 | d->len = off; |
295 | return rd; |
296 | } |
297 | |
298 | /* --- Append the character and continue --- */ |
299 | |
300 | d->buf[off++] = ch; |
301 | left--; rd++; |
302 | } |
303 | } |
304 | |
305 | /* --- @dstr_write@ --- * |
306 | * |
307 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
308 | * @FILE *fp@ = a stream to write on |
309 | * |
310 | * Returns: The number of bytes written (as for @fwrite@). |
311 | * |
312 | * Use: Writes a dynamic string to a file. |
313 | */ |
314 | |
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315 | size_t dstr_write(const dstr *d, FILE *fp) { return (DWRITE(d, fp)); } |
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316 | |
317 | /*----- That's all, folks -------------------------------------------------*/ |