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This helps catching cases where the format string doesn't match what is passed in, or injection bugs where user data is passed in as format string. Signed-off-by: Martin Storsjö <martin@martin.st>
135 lines
4.6 KiB
C
135 lines
4.6 KiB
C
/*
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* Copyright (c) 2007 Mans Rullgard
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVUTIL_AVSTRING_H
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#define AVUTIL_AVSTRING_H
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#include <stddef.h>
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#include "attributes.h"
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/**
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* Return non-zero if pfx is a prefix of str. If it is, *ptr is set to
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* the address of the first character in str after the prefix.
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*
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* @param str input string
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* @param pfx prefix to test
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* @param ptr updated if the prefix is matched inside str
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* @return non-zero if the prefix matches, zero otherwise
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*/
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int av_strstart(const char *str, const char *pfx, const char **ptr);
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/**
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* Return non-zero if pfx is a prefix of str independent of case. If
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* it is, *ptr is set to the address of the first character in str
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* after the prefix.
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*
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* @param str input string
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* @param pfx prefix to test
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* @param ptr updated if the prefix is matched inside str
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* @return non-zero if the prefix matches, zero otherwise
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*/
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int av_stristart(const char *str, const char *pfx, const char **ptr);
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/**
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* Locate the first case-independent occurrence in the string haystack
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* of the string needle. A zero-length string needle is considered to
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* match at the start of haystack.
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*
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* This function is a case-insensitive version of the standard strstr().
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*
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* @param haystack string to search in
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* @param needle string to search for
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* @return pointer to the located match within haystack
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* or a null pointer if no match
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*/
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char *av_stristr(const char *haystack, const char *needle);
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/**
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* Copy the string src to dst, but no more than size - 1 bytes, and
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* null-terminate dst.
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*
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* This function is the same as BSD strlcpy().
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*
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* @param dst destination buffer
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* @param src source string
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* @param size size of destination buffer
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* @return the length of src
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*
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* WARNING: since the return value is the length of src, src absolutely
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* _must_ be a properly 0-terminated string, otherwise this will read beyond
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* the end of the buffer and possibly crash.
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*/
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size_t av_strlcpy(char *dst, const char *src, size_t size);
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/**
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* Append the string src to the string dst, but to a total length of
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* no more than size - 1 bytes, and null-terminate dst.
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*
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* This function is similar to BSD strlcat(), but differs when
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* size <= strlen(dst).
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*
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* @param dst destination buffer
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* @param src source string
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* @param size size of destination buffer
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* @return the total length of src and dst
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*
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* WARNING: since the return value use the length of src and dst, these absolutely
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* _must_ be a properly 0-terminated strings, otherwise this will read beyond
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* the end of the buffer and possibly crash.
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*/
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size_t av_strlcat(char *dst, const char *src, size_t size);
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/**
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* Append output to a string, according to a format. Never write out of
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* the destination buffer, and always put a terminating 0 within
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* the buffer.
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* @param dst destination buffer (string to which the output is
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* appended)
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* @param size total size of the destination buffer
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* @param fmt printf-compatible format string, specifying how the
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* following parameters are used
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* @return the length of the string that would have been generated
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* if enough space had been available
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*/
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size_t av_strlcatf(char *dst, size_t size, const char *fmt, ...) av_printf_format(3, 4);
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/**
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* Convert a number to a av_malloced string.
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*/
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char *av_d2str(double d);
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/**
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* Unescape the given string until a non escaped terminating char,
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* and return the token corresponding to the unescaped string.
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*
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* The normal \ and ' escaping is supported. Leading and trailing
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* whitespaces are removed, unless they are escaped with '\' or are
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* enclosed between ''.
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*
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* @param buf the buffer to parse, buf will be updated to point to the
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* terminating char
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* @param term a 0-terminated list of terminating chars
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* @return the malloced unescaped string, which must be av_freed by
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* the user, NULL in case of allocation failure
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*/
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char *av_get_token(const char **buf, const char *term);
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#endif /* AVUTIL_AVSTRING_H */
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