avstring.c
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1 /*
2  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
3  * Copyright (c) 2007 Mans Rullgard
4  *
5  * This file is part of Libav.
6  *
7  * Libav is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * Libav is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include <stdarg.h>
23 #include <stdio.h>
24 #include <string.h>
25 #include <ctype.h>
26 #include "avstring.h"
27 #include "mem.h"
28 
29 int av_strstart(const char *str, const char *pfx, const char **ptr)
30 {
31  while (*pfx && *pfx == *str) {
32  pfx++;
33  str++;
34  }
35  if (!*pfx && ptr)
36  *ptr = str;
37  return !*pfx;
38 }
39 
40 int av_stristart(const char *str, const char *pfx, const char **ptr)
41 {
42  while (*pfx && toupper((unsigned)*pfx) == toupper((unsigned)*str)) {
43  pfx++;
44  str++;
45  }
46  if (!*pfx && ptr)
47  *ptr = str;
48  return !*pfx;
49 }
50 
51 char *av_stristr(const char *s1, const char *s2)
52 {
53  if (!*s2)
54  return s1;
55 
56  do {
57  if (av_stristart(s1, s2, NULL))
58  return s1;
59  } while (*s1++);
60 
61  return NULL;
62 }
63 
64 size_t av_strlcpy(char *dst, const char *src, size_t size)
65 {
66  size_t len = 0;
67  while (++len < size && *src)
68  *dst++ = *src++;
69  if (len <= size)
70  *dst = 0;
71  return len + strlen(src) - 1;
72 }
73 
74 size_t av_strlcat(char *dst, const char *src, size_t size)
75 {
76  size_t len = strlen(dst);
77  if (size <= len + 1)
78  return len + strlen(src);
79  return len + av_strlcpy(dst + len, src, size - len);
80 }
81 
82 size_t av_strlcatf(char *dst, size_t size, const char *fmt, ...)
83 {
84  int len = strlen(dst);
85  va_list vl;
86 
87  va_start(vl, fmt);
88  len += vsnprintf(dst + len, size > len ? size - len : 0, fmt, vl);
89  va_end(vl);
90 
91  return len;
92 }
93 
94 char *av_d2str(double d)
95 {
96  char *str= av_malloc(16);
97  if(str) snprintf(str, 16, "%f", d);
98  return str;
99 }
100 
101 #define WHITESPACES " \n\t"
102 
103 char *av_get_token(const char **buf, const char *term)
104 {
105  char *out = av_malloc(strlen(*buf) + 1);
106  char *ret= out, *end= out;
107  const char *p = *buf;
108  if (!out) return NULL;
109  p += strspn(p, WHITESPACES);
110 
111  while(*p && !strspn(p, term)) {
112  char c = *p++;
113  if(c == '\\' && *p){
114  *out++ = *p++;
115  end= out;
116  }else if(c == '\''){
117  while(*p && *p != '\'')
118  *out++ = *p++;
119  if(*p){
120  p++;
121  end= out;
122  }
123  }else{
124  *out++ = c;
125  }
126  }
127 
128  do{
129  *out-- = 0;
130  }while(out >= end && strspn(out, WHITESPACES));
131 
132  *buf = p;
133 
134  return ret;
135 }
136 
137 int av_strcasecmp(const char *a, const char *b)
138 {
139  uint8_t c1, c2;
140  do {
141  c1 = av_tolower(*a++);
142  c2 = av_tolower(*b++);
143  } while (c1 && c1 == c2);
144  return c1 - c2;
145 }
146 
147 int av_strncasecmp(const char *a, const char *b, size_t n)
148 {
149  const char *end = a + n;
150  uint8_t c1, c2;
151  do {
152  c1 = av_tolower(*a++);
153  c2 = av_tolower(*b++);
154  } while (a < end && c1 && c1 == c2);
155  return c1 - c2;
156 }
157 
158 #ifdef TEST
159 
160 #undef printf
161 
162 int main(void)
163 {
164  int i;
165 
166  printf("Testing av_get_token()\n");
167  {
168  const char *strings[] = {
169  "''",
170  "",
171  ":",
172  "\\",
173  "'",
174  " '' :",
175  " '' '' :",
176  "foo '' :",
177  "'foo'",
178  "foo ",
179  " ' foo ' ",
180  "foo\\",
181  "foo': blah:blah",
182  "foo\\: blah:blah",
183  "foo\'",
184  "'foo : ' :blahblah",
185  "\\ :blah",
186  " foo",
187  " foo ",
188  " foo \\ ",
189  "foo ':blah",
190  " foo bar : blahblah",
191  "\\f\\o\\o",
192  "'foo : \\ \\ ' : blahblah",
193  "'\\fo\\o:': blahblah",
194  "\\'fo\\o\\:': foo ' :blahblah"
195  };
196 
197  for (i=0; i < FF_ARRAY_ELEMS(strings); i++) {
198  const char *p= strings[i];
199  printf("|%s|", p);
200  printf(" -> |%s|", av_get_token(&p, ":"));
201  printf(" + |%s|\n", p);
202  }
203  }
204 
205  return 0;
206 }
207 
208 #endif /* TEST */