more untested bigendian fixes
[libav.git] / libavformat / cutils.c
CommitLineData
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1/*
2 * Various simple utilities for ffmpeg system
3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19#include "avformat.h"
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20
21#if !defined(CONFIG_NOCUTILS)
22/**
23 * Return TRUE if val is a prefix of str. If it returns TRUE, ptr is
24 * set to the next character in 'str' after the prefix.
25 *
26 * @param str input string
27 * @param val prefix to test
28 * @param ptr updated after the prefix in str in there is a match
29 * @return TRUE if there is a match
30 */
31int strstart(const char *str, const char *val, const char **ptr)
32{
33 const char *p, *q;
34 p = str;
35 q = val;
36 while (*q != '\0') {
37 if (*p != *q)
38 return 0;
39 p++;
40 q++;
41 }
42 if (ptr)
43 *ptr = p;
44 return 1;
45}
46
47/**
48 * Return TRUE if val is a prefix of str (case independent). If it
49 * returns TRUE, ptr is set to the next character in 'str' after the
50 * prefix.
51 *
52 * @param str input string
53 * @param val prefix to test
54 * @param ptr updated after the prefix in str in there is a match
55 * @return TRUE if there is a match */
56int stristart(const char *str, const char *val, const char **ptr)
57{
58 const char *p, *q;
59 p = str;
60 q = val;
61 while (*q != '\0') {
5c91a675 62 if (toupper(*(const unsigned char *)p) != toupper(*(const unsigned char *)q))
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63 return 0;
64 p++;
65 q++;
66 }
67 if (ptr)
68 *ptr = p;
69 return 1;
70}
71
72/**
73 * Copy the string str to buf. If str length is bigger than buf_size -
74 * 1 then it is clamped to buf_size - 1.
75 * NOTE: this function does what strncpy should have done to be
76 * useful. NEVER use strncpy.
77 *
78 * @param buf destination buffer
79 * @param buf_size size of destination buffer
80 * @param str source string
81 */
82void pstrcpy(char *buf, int buf_size, const char *str)
83{
84 int c;
85 char *q = buf;
86
87 if (buf_size <= 0)
88 return;
89
90 for(;;) {
91 c = *str++;
92 if (c == 0 || q >= buf + buf_size - 1)
93 break;
94 *q++ = c;
95 }
96 *q = '\0';
97}
98
99/* strcat and truncate. */
100char *pstrcat(char *buf, int buf_size, const char *s)
101{
102 int len;
103 len = strlen(buf);
104 if (len < buf_size)
105 pstrcpy(buf + len, buf_size - len, s);
106 return buf;
107}
108
109#endif
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110
111/* add one element to a dynamic array */
112void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem)
113{
114 int nb, nb_alloc;
115 unsigned long *tab;
116
117 nb = *nb_ptr;
118 tab = *tab_ptr;
119 if ((nb & (nb - 1)) == 0) {
120 if (nb == 0)
121 nb_alloc = 1;
122 else
123 nb_alloc = nb * 2;
124 tab = av_realloc(tab, nb_alloc * sizeof(unsigned long));
125 *tab_ptr = tab;
126 }
127 tab[nb++] = elem;
128 *nb_ptr = nb;
129}
130
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131time_t mktimegm(struct tm *tm)
132{
133 time_t t;
134
135 int y = tm->tm_year + 1900, m = tm->tm_mon + 1, d = tm->tm_mday;
136
137 if (m < 3) {
138 m += 12;
139 y--;
140 }
141
142 t = 86400 *
143 (d + (153 * m - 457) / 5 + 365 * y + y / 4 - y / 100 + y / 400 - 719469);
144
145 t += 3600 * tm->tm_hour + 60 * tm->tm_min + tm->tm_sec;
146
147 return t;
148}
149
150/* get a positive number between n_min and n_max, for a maximum length
151 of len_max. Return -1 if error. */
152static int date_get_num(const char **pp,
153 int n_min, int n_max, int len_max)
154{
155 int i, val, c;
156 const char *p;
157
158 p = *pp;
159 val = 0;
160 for(i = 0; i < len_max; i++) {
161 c = *p;
162 if (!isdigit(c))
163 break;
164 val = (val * 10) + c - '0';
165 p++;
166 }
167 /* no number read ? */
168 if (p == *pp)
169 return -1;
170 if (val < n_min || val > n_max)
171 return -1;
172 *pp = p;
173 return val;
174}
175
176/* small strptime for ffmpeg */
177const char *small_strptime(const char *p, const char *fmt,
178 struct tm *dt)
179{
180 int c, val;
181
182 for(;;) {
183 c = *fmt++;
184 if (c == '\0') {
185 return p;
186 } else if (c == '%') {
187 c = *fmt++;
188 switch(c) {
189 case 'H':
190 val = date_get_num(&p, 0, 23, 2);
191 if (val == -1)
192 return NULL;
193 dt->tm_hour = val;
194 break;
195 case 'M':
196 val = date_get_num(&p, 0, 59, 2);
197 if (val == -1)
198 return NULL;
199 dt->tm_min = val;
200 break;
201 case 'S':
202 val = date_get_num(&p, 0, 59, 2);
203 if (val == -1)
204 return NULL;
205 dt->tm_sec = val;
206 break;
207 case 'Y':
208 val = date_get_num(&p, 0, 9999, 4);
209 if (val == -1)
210 return NULL;
211 dt->tm_year = val - 1900;
212 break;
213 case 'm':
214 val = date_get_num(&p, 1, 12, 2);
215 if (val == -1)
216 return NULL;
217 dt->tm_mon = val - 1;
218 break;
219 case 'd':
220 val = date_get_num(&p, 1, 31, 2);
221 if (val == -1)
222 return NULL;
223 dt->tm_mday = val;
224 break;
225 case '%':
226 goto match;
227 default:
228 return NULL;
229 }
230 } else {
231 match:
232 if (c != *p)
233 return NULL;
234 p++;
235 }
236 }
237 return p;
238}
239