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