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1 | /* -*-c-*- |
2 | * |
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3 | * $Id$ |
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4 | * |
5 | * Various useful utilities, stolen from mLib |
6 | * |
7 | * (c) 2001 Mark Wooding |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Anag: a simple wordgame helper. |
13 | * |
14 | * Anag is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2 of the License, or |
17 | * (at your option) any later version. |
18 | * |
19 | * Anag 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 General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
25 | * along with Anag; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | */ |
28 | |
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29 | /*----- Header files ------------------------------------------------------*/ |
30 | |
31 | #include "anag.h" |
32 | |
33 | /*----- Static variables --------------------------------------------------*/ |
34 | |
35 | static const char *quis = "<unset>"; |
36 | |
37 | /*----- Error reporting ---------------------------------------------------*/ |
38 | |
39 | /* --- @ego@ --- * |
40 | * |
41 | * Arguments: @const char *p@ = pointer to program name |
42 | * |
43 | * Returns: --- |
44 | * |
45 | * Use: Stores what the program's name is. |
46 | */ |
47 | |
48 | #ifndef PATHSEP |
49 | # if defined(__riscos) |
50 | # define PATHSEP '.' |
51 | # elif defined(__unix) || defined(unix) |
52 | # define PATHSEP '/' |
53 | # else |
54 | # define PATHSEP '\\' |
55 | # endif |
56 | #endif |
57 | |
58 | void ego(const char *p) |
59 | { |
60 | const char *q = p; |
61 | while (*q) { |
62 | if (*q++ == PATHSEP) |
63 | p = q; |
64 | } |
65 | if (*p == '-') |
66 | p++; |
67 | quis = p; |
68 | } |
69 | |
70 | #undef PATHSEP |
71 | |
72 | /* --- @pquis@ --- * |
73 | * |
74 | * Arguments: @FILE *fp@ = output stream to write on |
75 | * @const char *p@ = pointer to string to write |
76 | * |
77 | * Returns: Zero if everything worked, EOF if not. |
78 | * |
79 | * Use: Writes the string @p@ to the output stream @fp@. Occurrences |
80 | * of the character `$' in @p@ are replaced by the program name |
81 | * as reported by @quis@. A `$$' is replaced by a single `$' |
82 | * sign. |
83 | */ |
84 | |
85 | int pquis(FILE *fp, const char *p) |
86 | { |
87 | size_t sz; |
88 | |
89 | while (*p) { |
90 | sz = strcspn(p, "$"); |
91 | if (sz) { |
92 | if (fwrite(p, 1, sz, fp) < sz) |
93 | return (EOF); |
94 | p += sz; |
95 | } |
96 | if (*p == '$') { |
97 | p++; |
98 | if (*p == '$') { |
99 | if (fputc('$', fp) == EOF) |
100 | return (EOF); |
101 | p++; |
102 | } else { |
103 | if (fputs(quis, fp) == EOF) |
104 | return (EOF); |
105 | } |
106 | } |
107 | } |
108 | return (0); |
109 | } |
110 | |
111 | /* --- @die@ --- * |
112 | * |
113 | * Arguments: @const char *f@ = a @printf@-style format string |
114 | * @...@ = other arguments |
115 | * |
116 | * Returns: Never. |
117 | * |
118 | * Use: Reports an error and exits. |
119 | */ |
120 | |
121 | void die(const char *f, ...) |
122 | { |
123 | va_list ap; |
124 | va_start(ap, f); |
125 | fprintf(stderr, "%s: ", quis); |
126 | vfprintf(stderr, f, ap); |
127 | va_end(ap); |
128 | putc('\n', stderr); |
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129 | exit(EX_FAIL); |
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130 | } |
131 | |
132 | /*----- Memory allocation -------------------------------------------------*/ |
133 | |
134 | /* --- @xmalloc@ --- * |
135 | * |
136 | * Arguments: @size_t sz@ = size of block to allocate |
137 | * |
138 | * Returns: Pointer to allocated block. |
139 | * |
140 | * Use: Allocates memory. If there's not enough memory, the |
141 | * program exits. |
142 | */ |
143 | |
144 | void *xmalloc(size_t sz) |
145 | { |
146 | void *p = malloc(sz); |
147 | if (!p) |
148 | die("not enough memory"); |
149 | return (p); |
150 | } |
151 | |
152 | /* --- @xrealloc@ --- * |
153 | * |
154 | * Arguments: @void *p@ = a pointer to allocated memory |
155 | * @size_t sz@ = new size of block wanted |
156 | * |
157 | * Returns: Pointer to resized block. |
158 | * |
159 | * Use: Resizes an allocated block. If there's not enough memory, |
160 | * the program exits. |
161 | */ |
162 | |
163 | void *xrealloc(void *p, size_t sz) |
164 | { |
165 | p = realloc(p, sz); |
166 | if (!p) |
167 | die("not enough memory"); |
168 | return (p); |
169 | } |
170 | |
171 | /*----- Dynamic string handling -------------------------------------------*/ |
172 | |
173 | #define DSTR_INITSZ 64 |
174 | |
175 | /* --- @dstr_destroy@ --- * |
176 | * |
177 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
178 | * |
179 | * Returns: --- |
180 | * |
181 | * Use: Reclaims the space used by a dynamic string. |
182 | */ |
183 | |
184 | void dstr_destroy(dstr *d) { free(d->buf); d->len = 0; d->sz = 0; } |
185 | |
186 | /* --- @dstr_reset@ --- * |
187 | * |
188 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
189 | * |
190 | * Returns: --- |
191 | * |
192 | * Use: Resets a string so that new data gets put at the beginning. |
193 | */ |
194 | |
195 | void dstr_reset(dstr *d) { d->len = 0; } |
196 | |
197 | /* --- @dstr_ensure@ --- * |
198 | * |
199 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
200 | * @size_t sz@ = amount of free space to ensure |
201 | * |
202 | * Returns: --- |
203 | * |
204 | * Use: Ensures that at least @sz@ bytes are available in the |
205 | * given string. |
206 | */ |
207 | |
208 | void dstr_ensure(dstr *d, size_t sz) |
209 | { |
210 | size_t rq = d->len + sz; |
211 | size_t nsz; |
212 | |
213 | /* --- If we have enough space, just leave it --- */ |
214 | |
215 | if (rq <= d->sz) |
216 | return; |
217 | |
218 | /* --- Grow the buffer --- */ |
219 | |
220 | nsz = d->sz; |
221 | |
222 | if (nsz == 0) |
223 | nsz = (DSTR_INITSZ >> 1); |
224 | do nsz <<= 1; while (nsz < rq); |
225 | |
226 | if (d->buf) |
227 | d->buf = xrealloc(d->buf, nsz); |
228 | else |
229 | d->buf = xmalloc(nsz); |
230 | d->sz = nsz; |
231 | } |
232 | |
233 | /* --- @dstr_putline@ --- * |
234 | * |
235 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
236 | * @FILE *fp@ = a stream to read from |
237 | * |
238 | * Returns: The number of characters read into the buffer, or @EOF@ if |
239 | * end-of-file was reached before any characters were read. |
240 | * |
241 | * Use: Appends the next line from the given input stream to the |
242 | * string. A trailing newline is not added; a trailing null |
243 | * byte is appended, as for @dstr_putz@. |
244 | */ |
245 | |
246 | int dstr_putline(dstr *d, FILE *fp) |
247 | { |
248 | size_t left = d->sz - d->len; |
249 | size_t off = d->len; |
250 | int rd = 0; |
251 | int ch; |
252 | |
253 | for (;;) { |
254 | |
255 | /* --- Read the next byte --- */ |
256 | |
257 | ch = getc(fp); |
258 | |
259 | /* --- End-of-file when no characters read is special --- */ |
260 | |
261 | if (ch == EOF && !rd) |
262 | return (EOF); |
263 | |
264 | /* --- Make sure there's some buffer space --- */ |
265 | |
266 | if (!left) { |
267 | d->len = off; |
268 | dstr_ensure(d, 1); |
269 | left = d->sz - off; |
270 | } |
271 | |
272 | /* --- End-of-file or newline ends the loop --- */ |
273 | |
274 | if (ch == EOF || ch == '\n') { |
275 | d->buf[off] = 0; |
276 | d->len = off; |
277 | return rd; |
278 | } |
279 | |
280 | /* --- Append the character and continue --- */ |
281 | |
282 | d->buf[off++] = ch; |
283 | left--; rd++; |
284 | } |
285 | } |
286 | |
287 | /*----- That's all, folks -------------------------------------------------*/ |