yading@11: /*
yading@11:  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
yading@11:  * Copyright (c) 2007 Mans Rullgard
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include <stdarg.h>
yading@11: #include <stdint.h>
yading@11: #include <stdio.h>
yading@11: #include <string.h>
yading@11: 
yading@11: #include "config.h"
yading@11: #include "common.h"
yading@11: #include "mem.h"
yading@11: #include "avstring.h"
yading@11: #include "bprint.h"
yading@11: 
yading@11: int av_strstart(const char *str, const char *pfx, const char **ptr)
yading@11: {
yading@11:     while (*pfx && *pfx == *str) {
yading@11:         pfx++;
yading@11:         str++;
yading@11:     }
yading@11:     if (!*pfx && ptr)
yading@11:         *ptr = str;
yading@11:     return !*pfx;
yading@11: }
yading@11: 
yading@11: int av_stristart(const char *str, const char *pfx, const char **ptr)
yading@11: {
yading@11:     while (*pfx && av_toupper((unsigned)*pfx) == av_toupper((unsigned)*str)) {
yading@11:         pfx++;
yading@11:         str++;
yading@11:     }
yading@11:     if (!*pfx && ptr)
yading@11:         *ptr = str;
yading@11:     return !*pfx;
yading@11: }
yading@11: 
yading@11: char *av_stristr(const char *s1, const char *s2)
yading@11: {
yading@11:     if (!*s2)
yading@11:         return (char*)(intptr_t)s1;
yading@11: 
yading@11:     do
yading@11:         if (av_stristart(s1, s2, NULL))
yading@11:             return (char*)(intptr_t)s1;
yading@11:     while (*s1++);
yading@11: 
yading@11:     return NULL;
yading@11: }
yading@11: 
yading@11: char *av_strnstr(const char *haystack, const char *needle, size_t hay_length)
yading@11: {
yading@11:     size_t needle_len = strlen(needle);
yading@11:     if (!needle_len)
yading@11:         return (char*)haystack;
yading@11:     while (hay_length >= needle_len) {
yading@11:         hay_length--;
yading@11:         if (!memcmp(haystack, needle, needle_len))
yading@11:             return (char*)haystack;
yading@11:         haystack++;
yading@11:     }
yading@11:     return NULL;
yading@11: }
yading@11: 
yading@11: size_t av_strlcpy(char *dst, const char *src, size_t size)
yading@11: {
yading@11:     size_t len = 0;
yading@11:     while (++len < size && *src)
yading@11:         *dst++ = *src++;
yading@11:     if (len <= size)
yading@11:         *dst = 0;
yading@11:     return len + strlen(src) - 1;
yading@11: }
yading@11: 
yading@11: size_t av_strlcat(char *dst, const char *src, size_t size)
yading@11: {
yading@11:     size_t len = strlen(dst);
yading@11:     if (size <= len + 1)
yading@11:         return len + strlen(src);
yading@11:     return len + av_strlcpy(dst + len, src, size - len);
yading@11: }
yading@11: 
yading@11: size_t av_strlcatf(char *dst, size_t size, const char *fmt, ...)
yading@11: {
yading@11:     int len = strlen(dst);
yading@11:     va_list vl;
yading@11: 
yading@11:     va_start(vl, fmt);
yading@11:     len += vsnprintf(dst + len, size > len ? size - len : 0, fmt, vl);
yading@11:     va_end(vl);
yading@11: 
yading@11:     return len;
yading@11: }
yading@11: 
yading@11: char *av_asprintf(const char *fmt, ...)
yading@11: {
yading@11:     char *p = NULL;
yading@11:     va_list va;
yading@11:     int len;
yading@11: 
yading@11:     va_start(va, fmt);
yading@11:     len = vsnprintf(NULL, 0, fmt, va);
yading@11:     va_end(va);
yading@11:     if (len < 0)
yading@11:         goto end;
yading@11: 
yading@11:     p = av_malloc(len + 1);
yading@11:     if (!p)
yading@11:         goto end;
yading@11: 
yading@11:     va_start(va, fmt);
yading@11:     len = vsnprintf(p, len + 1, fmt, va);
yading@11:     va_end(va);
yading@11:     if (len < 0)
yading@11:         av_freep(&p);
yading@11: 
yading@11: end:
yading@11:     return p;
yading@11: }
yading@11: 
yading@11: char *av_d2str(double d)
yading@11: {
yading@11:     char *str = av_malloc(16);
yading@11:     if (str)
yading@11:         snprintf(str, 16, "%f", d);
yading@11:     return str;
yading@11: }
yading@11: 
yading@11: #define WHITESPACES " \n\t"
yading@11: 
yading@11: char *av_get_token(const char **buf, const char *term)
yading@11: {
yading@11:     char *out     = av_malloc(strlen(*buf) + 1);
yading@11:     char *ret     = out, *end = out;
yading@11:     const char *p = *buf;
yading@11:     if (!out)
yading@11:         return NULL;
yading@11:     p += strspn(p, WHITESPACES);
yading@11: 
yading@11:     while (*p && !strspn(p, term)) {
yading@11:         char c = *p++;
yading@11:         if (c == '\\' && *p) {
yading@11:             *out++ = *p++;
yading@11:             end    = out;
yading@11:         } else if (c == '\'') {
yading@11:             while (*p && *p != '\'')
yading@11:                 *out++ = *p++;
yading@11:             if (*p) {
yading@11:                 p++;
yading@11:                 end = out;
yading@11:             }
yading@11:         } else {
yading@11:             *out++ = c;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     do
yading@11:         *out-- = 0;
yading@11:     while (out >= end && strspn(out, WHITESPACES));
yading@11: 
yading@11:     *buf = p;
yading@11: 
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: char *av_strtok(char *s, const char *delim, char **saveptr)
yading@11: {
yading@11:     char *tok;
yading@11: 
yading@11:     if (!s && !(s = *saveptr))
yading@11:         return NULL;
yading@11: 
yading@11:     /* skip leading delimiters */
yading@11:     s += strspn(s, delim);
yading@11: 
yading@11:     /* s now points to the first non delimiter char, or to the end of the string */
yading@11:     if (!*s) {
yading@11:         *saveptr = NULL;
yading@11:         return NULL;
yading@11:     }
yading@11:     tok = s++;
yading@11: 
yading@11:     /* skip non delimiters */
yading@11:     s += strcspn(s, delim);
yading@11:     if (*s) {
yading@11:         *s = 0;
yading@11:         *saveptr = s+1;
yading@11:     } else {
yading@11:         *saveptr = NULL;
yading@11:     }
yading@11: 
yading@11:     return tok;
yading@11: }
yading@11: 
yading@11: int av_strcasecmp(const char *a, const char *b)
yading@11: {
yading@11:     uint8_t c1, c2;
yading@11:     do {
yading@11:         c1 = av_tolower(*a++);
yading@11:         c2 = av_tolower(*b++);
yading@11:     } while (c1 && c1 == c2);
yading@11:     return c1 - c2;
yading@11: }
yading@11: 
yading@11: int av_strncasecmp(const char *a, const char *b, size_t n)
yading@11: {
yading@11:     const char *end = a + n;
yading@11:     uint8_t c1, c2;
yading@11:     do {
yading@11:         c1 = av_tolower(*a++);
yading@11:         c2 = av_tolower(*b++);
yading@11:     } while (a < end && c1 && c1 == c2);
yading@11:     return c1 - c2;
yading@11: }
yading@11: 
yading@11: const char *av_basename(const char *path)
yading@11: {
yading@11:     char *p = strrchr(path, '/');
yading@11: 
yading@11: #if HAVE_DOS_PATHS
yading@11:     char *q = strrchr(path, '\\');
yading@11:     char *d = strchr(path, ':');
yading@11: 
yading@11:     p = FFMAX3(p, q, d);
yading@11: #endif
yading@11: 
yading@11:     if (!p)
yading@11:         return path;
yading@11: 
yading@11:     return p + 1;
yading@11: }
yading@11: 
yading@11: const char *av_dirname(char *path)
yading@11: {
yading@11:     char *p = strrchr(path, '/');
yading@11: 
yading@11: #if HAVE_DOS_PATHS
yading@11:     char *q = strrchr(path, '\\');
yading@11:     char *d = strchr(path, ':');
yading@11: 
yading@11:     d = d ? d + 1 : d;
yading@11: 
yading@11:     p = FFMAX3(p, q, d);
yading@11: #endif
yading@11: 
yading@11:     if (!p)
yading@11:         return ".";
yading@11: 
yading@11:     *p = '\0';
yading@11: 
yading@11:     return path;
yading@11: }
yading@11: 
yading@11: int av_escape(char **dst, const char *src, const char *special_chars,
yading@11:               enum AVEscapeMode mode, int flags)
yading@11: {
yading@11:     AVBPrint dstbuf;
yading@11: 
yading@11:     av_bprint_init(&dstbuf, 1, AV_BPRINT_SIZE_UNLIMITED);
yading@11:     av_bprint_escape(&dstbuf, src, special_chars, mode, flags);
yading@11: 
yading@11:     if (!av_bprint_is_complete(&dstbuf)) {
yading@11:         av_bprint_finalize(&dstbuf, NULL);
yading@11:         return AVERROR(ENOMEM);
yading@11:     } else {
yading@11:         av_bprint_finalize(&dstbuf, dst);
yading@11:         return dstbuf.len;
yading@11:     }
yading@11: }
yading@11: 
yading@11: int av_isdigit(int c)
yading@11: {
yading@11:     return c >= '0' && c <= '9';
yading@11: }
yading@11: 
yading@11: int av_isgraph(int c)
yading@11: {
yading@11:     return c > 32 && c < 127;
yading@11: }
yading@11: 
yading@11: int av_isspace(int c)
yading@11: {
yading@11:     return c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' ||
yading@11:            c == '\v';
yading@11: }
yading@11: 
yading@11: int av_isxdigit(int c)
yading@11: {
yading@11:     c = av_tolower(c);
yading@11:     return av_isdigit(c) || (c >= 'a' && c <= 'f');
yading@11: }
yading@11: 
yading@11: #ifdef TEST
yading@11: 
yading@11: int main(void)
yading@11: {
yading@11:     int i;
yading@11:     const char *strings[] = {
yading@11:         "''",
yading@11:         "",
yading@11:         ":",
yading@11:         "\\",
yading@11:         "'",
yading@11:         "    ''    :",
yading@11:         "    ''  ''  :",
yading@11:         "foo   '' :",
yading@11:         "'foo'",
yading@11:         "foo     ",
yading@11:         "  '  foo  '  ",
yading@11:         "foo\\",
yading@11:         "foo':  blah:blah",
yading@11:         "foo\\:  blah:blah",
yading@11:         "foo\'",
yading@11:         "'foo :  '  :blahblah",
yading@11:         "\\ :blah",
yading@11:         "     foo",
yading@11:         "      foo       ",
yading@11:         "      foo     \\ ",
yading@11:         "foo ':blah",
yading@11:         " foo   bar    :   blahblah",
yading@11:         "\\f\\o\\o",
yading@11:         "'foo : \\ \\  '   : blahblah",
yading@11:         "'\\fo\\o:': blahblah",
yading@11:         "\\'fo\\o\\:':  foo  '  :blahblah"
yading@11:     };
yading@11: 
yading@11:     printf("Testing av_get_token()\n");
yading@11:     for (i = 0; i < FF_ARRAY_ELEMS(strings); i++) {
yading@11:         const char *p = strings[i];
yading@11:         char *q;
yading@11:         printf("|%s|", p);
yading@11:         q = av_get_token(&p, ":");
yading@11:         printf(" -> |%s|", q);
yading@11:         printf(" + |%s|\n", p);
yading@11:         av_free(q);
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: #endif /* TEST */