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/*

 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard

 * Copyright (c) 2007 Mans Rullgard

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * FFmpeg is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#include 

#include 

#include 

#include 

#include "config.h"

#include "common.h"

#include "mem.h"

#include "avstring.h"

#include "bprint.h"

int av_strstart(const char *str, const char *pfx, const char **ptr)

{

    while (*pfx && *pfx == *str) {

        pfx++;

        str++;

    }

    if (!*pfx && ptr)

        *ptr = str;

    return !*pfx;

}

int av_stristart(const char *str, const char *pfx, const char **ptr)

{

    while (*pfx && av_toupper((unsigned)*pfx) == av_toupper((unsigned)*str)) {

        pfx++;

        str++;

    }

    if (!*pfx && ptr)

        *ptr = str;

    return !*pfx;

}

char *av_stristr(const char *s1, const char *s2)

{

    if (!*s2)

        return (char*)(intptr_t)s1;

    do

        if (av_stristart(s1, s2, NULL))

            return (char*)(intptr_t)s1;

    while (*s1++);

    return NULL;

}

char *av_strnstr(const char *haystack, const char *needle, size_t hay_length)

{

    size_t needle_len = strlen(needle);

    if (!needle_len)

        return (char*)haystack;

    while (hay_length >= needle_len) {

        hay_length--;

        if (!memcmp(haystack, needle, needle_len))

            return (char*)haystack;

        haystack++;

    }

    return NULL;

}

size_t av_strlcpy(char *dst, const char *src, size_t size)

{

    size_t len = 0;

    while (++len < size && *src)

        *dst++ = *src++;

    if (len <= size)

        *dst = 0;

    return len + strlen(src) - 1;

}

size_t av_strlcat(char *dst, const char *src, size_t size)

{

    size_t len = strlen(dst);

    if (size <= len + 1)

        return len + strlen(src);

    return len + av_strlcpy(dst + len, src, size - len);

}

size_t av_strlcatf(char *dst, size_t size, const char *fmt, ...)

{

    int len = strlen(dst);

    va_list vl;

    va_start(vl, fmt);

    len += vsnprintf(dst + len, size > len ? size - len : 0, fmt, vl);

    va_end(vl);

    return len;

}

char *av_asprintf(const char *fmt, ...)

{

    char *p = NULL;

    va_list va;

    int len;

    va_start(va, fmt);

    len = vsnprintf(NULL, 0, fmt, va);

    va_end(va);

    if (len < 0)

        goto end;

    p = av_malloc(len + 1);

    if (!p)

        goto end;

    va_start(va, fmt);

    len = vsnprintf(p, len + 1, fmt, va);

    va_end(va);

    if (len < 0)

        av_freep(&p);

end:

    return p;

}

char *av_d2str(double d)

{

    char *str = av_malloc(16);

    if (str)

        snprintf(str, 16, "%f", d);

    return str;

}

#define WHITESPACES " \n\t"

char *av_get_token(const char **buf, const char *term)

{

    char *out     = av_malloc(strlen(*buf) + 1);

    char *ret     = out, *end = out;

    const char *p = *buf;

    if (!out)

        return NULL;

    p += strspn(p, WHITESPACES);

    while (*p && !strspn(p, term)) {

        char c = *p++;

        if (c == '\\' && *p) {

            *out++ = *p++;

            end    = out;

        } else if (c == '\'') {

            while (*p && *p != '\'')

                *out++ = *p++;

            if (*p) {

                p++;

                end = out;

            }

        } else {

            *out++ = c;

        }

    }

    do

        *out-- = 0;

    while (out >= end && strspn(out, WHITESPACES));

    *buf = p;

    return ret;

}

char *av_strtok(char *s, const char *delim, char **saveptr)

{

    char *tok;

    if (!s && !(s = *saveptr))

        return NULL;

    /* skip leading delimiters */

    s += strspn(s, delim);

    /* s now points to the first non delimiter char, or to the end of the string */

    if (!*s) {

        *saveptr = NULL;

        return NULL;

    }

    tok = s++;

    /* skip non delimiters */

    s += strcspn(s, delim);

    if (*s) {

        *s = 0;

        *saveptr = s+1;

    } else {

        *saveptr = NULL;

    }

    return tok;

}

int av_strcasecmp(const char *a, const char *b)

{

    uint8_t c1, c2;

    do {

        c1 = av_tolower(*a++);

        c2 = av_tolower(*b++);

    } while (c1 && c1 == c2);

    return c1 - c2;

}

int av_strncasecmp(const char *a, const char *b, size_t n)

{

    const char *end = a + n;

    uint8_t c1, c2;

    do {

        c1 = av_tolower(*a++);

        c2 = av_tolower(*b++);

    } while (a < end && c1 && c1 == c2);

    return c1 - c2;

}

const char *av_basename(const char *path)

{

    char *p = strrchr(path, '/');

#if HAVE_DOS_PATHS

    char *q = strrchr(path, '\\');

    char *d = strchr(path, ':');

    p = FFMAX3(p, q, d);

#endif

    if (!p)

        return path;

    return p + 1;

}

const char *av_dirname(char *path)

{

    char *p = strrchr(path, '/');

#if HAVE_DOS_PATHS

    char *q = strrchr(path, '\\');

    char *d = strchr(path, ':');

    d = d ? d + 1 : d;

    p = FFMAX3(p, q, d);

#endif

    if (!p)

        return ".";

    *p = '\0';

    return path;

}

int av_escape(char **dst, const char *src, const char *special_chars,

              enum AVEscapeMode mode, int flags)

{

    AVBPrint dstbuf;

    av_bprint_init(&dstbuf, 1, AV_BPRINT_SIZE_UNLIMITED);

    av_bprint_escape(&dstbuf, src, special_chars, mode, flags);

    if (!av_bprint_is_complete(&dstbuf)) {

        av_bprint_finalize(&dstbuf, NULL);

        return AVERROR(ENOMEM);

    } else {

        av_bprint_finalize(&dstbuf, dst);

        return dstbuf.len;

    }

}

int av_isdigit(int c)

{

    return c >= '0' && c <= '9';

}

int av_isgraph(int c)

{

    return c > 32 && c < 127;

}

int av_isspace(int c)

{

    return c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' ||

           c == '\v';

}

int av_isxdigit(int c)

{

    c = av_tolower(c);

    return av_isdigit(c) || (c >= 'a' && c <= 'f');

}

#ifdef TEST

int main(void)

{

    int i;

    static const char * const strings[] = {

        "''",

        "",

        ":",

        "\\",

        "'",

        "    ''    :",

        "    ''  ''  :",

        "foo   '' :",

        "'foo'",

        "foo     ",

        "  '  foo  '  ",

        "foo\\",

        "foo':  blah:blah",

        "foo\\:  blah:blah",

        "foo\'",

        "'foo :  '  :blahblah",

        "\\ :blah",

        "     foo",

        "      foo       ",

        "      foo     \\ ",

        "foo ':blah",

        " foo   bar    :   blahblah",

        "\\f\\o\\o",

        "'foo : \\ \\  '   : blahblah",

        "'\\fo\\o:': blahblah",

        "\\'fo\\o\\:':  foo  '  :blahblah"

    };

    printf("Testing av_get_token()\n");

    for (i = 0; i < FF_ARRAY_ELEMS(strings); i++) {

        const char *p = strings[i];

        char *q;

        printf("|%s|", p);

        q = av_get_token(&p, ":");

        printf(" -> |%s|", q);

        printf(" + |%s|\n", p);

        av_free(q);

    }

    return 0;

}

#endif /* TEST */