--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/libavutil/avstring.h	Tue Dec 31 14:52:14 2013 +0000
@@ -0,0 +1,302 @@
+/*
+ * 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
+ */
+
+#ifndef AVUTIL_AVSTRING_H
+#define AVUTIL_AVSTRING_H
+
+#include <stddef.h>
+#include "attributes.h"
+
+/**
+ * @addtogroup lavu_string
+ * @{
+ */
+
+/**
+ * Return non-zero if pfx is a prefix of str. If it is, *ptr is set to
+ * the address of the first character in str after the prefix.
+ *
+ * @param str input string
+ * @param pfx prefix to test
+ * @param ptr updated if the prefix is matched inside str
+ * @return non-zero if the prefix matches, zero otherwise
+ */
+int av_strstart(const char *str, const char *pfx, const char **ptr);
+
+/**
+ * Return non-zero if pfx is a prefix of str independent of case. If
+ * it is, *ptr is set to the address of the first character in str
+ * after the prefix.
+ *
+ * @param str input string
+ * @param pfx prefix to test
+ * @param ptr updated if the prefix is matched inside str
+ * @return non-zero if the prefix matches, zero otherwise
+ */
+int av_stristart(const char *str, const char *pfx, const char **ptr);
+
+/**
+ * Locate the first case-independent occurrence in the string haystack
+ * of the string needle.  A zero-length string needle is considered to
+ * match at the start of haystack.
+ *
+ * This function is a case-insensitive version of the standard strstr().
+ *
+ * @param haystack string to search in
+ * @param needle   string to search for
+ * @return         pointer to the located match within haystack
+ *                 or a null pointer if no match
+ */
+char *av_stristr(const char *haystack, const char *needle);
+
+/**
+ * Locate the first occurrence of the string needle in the string haystack
+ * where not more than hay_length characters are searched. A zero-length
+ * string needle is considered to match at the start of haystack.
+ *
+ * This function is a length-limited version of the standard strstr().
+ *
+ * @param haystack   string to search in
+ * @param needle     string to search for
+ * @param hay_length length of string to search in
+ * @return           pointer to the located match within haystack
+ *                   or a null pointer if no match
+ */
+char *av_strnstr(const char *haystack, const char *needle, size_t hay_length);
+
+/**
+ * Copy the string src to dst, but no more than size - 1 bytes, and
+ * null-terminate dst.
+ *
+ * This function is the same as BSD strlcpy().
+ *
+ * @param dst destination buffer
+ * @param src source string
+ * @param size size of destination buffer
+ * @return the length of src
+ *
+ * @warning since the return value is the length of src, src absolutely
+ * _must_ be a properly 0-terminated string, otherwise this will read beyond
+ * the end of the buffer and possibly crash.
+ */
+size_t av_strlcpy(char *dst, const char *src, size_t size);
+
+/**
+ * Append the string src to the string dst, but to a total length of
+ * no more than size - 1 bytes, and null-terminate dst.
+ *
+ * This function is similar to BSD strlcat(), but differs when
+ * size <= strlen(dst).
+ *
+ * @param dst destination buffer
+ * @param src source string
+ * @param size size of destination buffer
+ * @return the total length of src and dst
+ *
+ * @warning since the return value use the length of src and dst, these
+ * absolutely _must_ be a properly 0-terminated strings, otherwise this
+ * will read beyond the end of the buffer and possibly crash.
+ */
+size_t av_strlcat(char *dst, const char *src, size_t size);
+
+/**
+ * Append output to a string, according to a format. Never write out of
+ * the destination buffer, and always put a terminating 0 within
+ * the buffer.
+ * @param dst destination buffer (string to which the output is
+ *  appended)
+ * @param size total size of the destination buffer
+ * @param fmt printf-compatible format string, specifying how the
+ *  following parameters are used
+ * @return the length of the string that would have been generated
+ *  if enough space had been available
+ */
+size_t av_strlcatf(char *dst, size_t size, const char *fmt, ...) av_printf_format(3, 4);
+
+/**
+ * Print arguments following specified format into a large enough auto
+ * allocated buffer. It is similar to GNU asprintf().
+ * @param fmt printf-compatible format string, specifying how the
+ *            following parameters are used.
+ * @return the allocated string
+ * @note You have to free the string yourself with av_free().
+ */
+char *av_asprintf(const char *fmt, ...) av_printf_format(1, 2);
+
+/**
+ * Convert a number to a av_malloced string.
+ */
+char *av_d2str(double d);
+
+/**
+ * Unescape the given string until a non escaped terminating char,
+ * and return the token corresponding to the unescaped string.
+ *
+ * The normal \ and ' escaping is supported. Leading and trailing
+ * whitespaces are removed, unless they are escaped with '\' or are
+ * enclosed between ''.
+ *
+ * @param buf the buffer to parse, buf will be updated to point to the
+ * terminating char
+ * @param term a 0-terminated list of terminating chars
+ * @return the malloced unescaped string, which must be av_freed by
+ * the user, NULL in case of allocation failure
+ */
+char *av_get_token(const char **buf, const char *term);
+
+/**
+ * Split the string into several tokens which can be accessed by
+ * successive calls to av_strtok().
+ *
+ * A token is defined as a sequence of characters not belonging to the
+ * set specified in delim.
+ *
+ * On the first call to av_strtok(), s should point to the string to
+ * parse, and the value of saveptr is ignored. In subsequent calls, s
+ * should be NULL, and saveptr should be unchanged since the previous
+ * call.
+ *
+ * This function is similar to strtok_r() defined in POSIX.1.
+ *
+ * @param s the string to parse, may be NULL
+ * @param delim 0-terminated list of token delimiters, must be non-NULL
+ * @param saveptr user-provided pointer which points to stored
+ * information necessary for av_strtok() to continue scanning the same
+ * string. saveptr is updated to point to the next character after the
+ * first delimiter found, or to NULL if the string was terminated
+ * @return the found token, or NULL when no token is found
+ */
+char *av_strtok(char *s, const char *delim, char **saveptr);
+
+/**
+ * Locale-independent conversion of ASCII isdigit.
+ */
+int av_isdigit(int c);
+
+/**
+ * Locale-independent conversion of ASCII isgraph.
+ */
+int av_isgraph(int c);
+
+/**
+ * Locale-independent conversion of ASCII isspace.
+ */
+int av_isspace(int c);
+
+/**
+ * Locale-independent conversion of ASCII characters to uppercase.
+ */
+static inline int av_toupper(int c)
+{
+    if (c >= 'a' && c <= 'z')
+        c ^= 0x20;
+    return c;
+}
+
+/**
+ * Locale-independent conversion of ASCII characters to lowercase.
+ */
+static inline int av_tolower(int c)
+{
+    if (c >= 'A' && c <= 'Z')
+        c ^= 0x20;
+    return c;
+}
+
+/**
+ * Locale-independent conversion of ASCII isxdigit.
+ */
+int av_isxdigit(int c);
+
+/**
+ * Locale-independent case-insensitive compare.
+ * @note This means only ASCII-range characters are case-insensitive
+ */
+int av_strcasecmp(const char *a, const char *b);
+
+/**
+ * Locale-independent case-insensitive compare.
+ * @note This means only ASCII-range characters are case-insensitive
+ */
+int av_strncasecmp(const char *a, const char *b, size_t n);
+
+
+/**
+ * Thread safe basename.
+ * @param path the path, on DOS both \ and / are considered separators.
+ * @return pointer to the basename substring.
+ */
+const char *av_basename(const char *path);
+
+/**
+ * Thread safe dirname.
+ * @param path the path, on DOS both \ and / are considered separators.
+ * @return the path with the separator replaced by the string terminator or ".".
+ * @note the function may change the input string.
+ */
+const char *av_dirname(char *path);
+
+enum AVEscapeMode {
+    AV_ESCAPE_MODE_AUTO,      ///< Use auto-selected escaping mode.
+    AV_ESCAPE_MODE_BACKSLASH, ///< Use backslash escaping.
+    AV_ESCAPE_MODE_QUOTE,     ///< Use single-quote escaping.
+};
+
+/**
+ * Consider spaces special and escape them even in the middle of the
+ * string.
+ *
+ * This is equivalent to adding the whitespace characters to the special
+ * characters lists, except it is guaranteed to use the exact same list
+ * of whitespace characters as the rest of libavutil.
+ */
+#define AV_ESCAPE_FLAG_WHITESPACE 0x01
+
+/**
+ * Escape only specified special characters.
+ * Without this flag, escape also any characters that may be considered
+ * special by av_get_token(), such as the single quote.
+ */
+#define AV_ESCAPE_FLAG_STRICT 0x02
+
+/**
+ * Escape string in src, and put the escaped string in an allocated
+ * string in *dst, which must be freed with av_free().
+ *
+ * @param dst           pointer where an allocated string is put
+ * @param src           string to escape, must be non-NULL
+ * @param special_chars string containing the special characters which
+ *                      need to be escaped, can be NULL
+ * @param mode          escape mode to employ, see AV_ESCAPE_MODE_* macros.
+ *                      Any unknown value for mode will be considered equivalent to
+ *                      AV_ESCAPE_MODE_BACKSLASH, but this behaviour can change without
+ *                      notice.
+ * @param flags         flags which control how to escape, see AV_ESCAPE_FLAG_ macros
+ * @return the length of the allocated string, or a negative error code in case of error
+ * @see av_bprint_escape()
+ */
+int av_escape(char **dst, const char *src, const char *special_chars,
+              enum AVEscapeMode mode, int flags);
+
+/**
+ * @}
+ */
+
+#endif /* AVUTIL_AVSTRING_H */