From fc78ce803bd4fb2431a843224b572d543580d275 Mon Sep 17 00:00:00 2001 From: Måns Rullgård Date: Sat, 23 Jun 2007 23:10:26 +0000 Subject: add some string functions Originally committed as revision 9400 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavutil/Makefile | 3 ++- libavutil/avstring.h | 76 ++++++++++++++++++++++++++++++++++++++++++++++++++++ libavutil/string.c | 58 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 136 insertions(+), 1 deletion(-) create mode 100644 libavutil/avstring.h create mode 100644 libavutil/string.c (limited to 'libavutil') diff --git a/libavutil/Makefile b/libavutil/Makefile index a760401ab7..ffe3775b73 100644 --- a/libavutil/Makefile +++ b/libavutil/Makefile @@ -15,10 +15,11 @@ OBJS= mathematics.o \ random.o \ aes.o \ base64.o \ + string.o \ HEADERS = avutil.h common.h mathematics.h integer.h rational.h \ intfloat_readwrite.h md5.h adler32.h log.h fifo.h lzo.h \ - random.h mem.h base64.h + random.h mem.h base64.h avstring.h NAME=avutil LIBVERSION=$(LAVUVERSION) diff --git a/libavutil/avstring.h b/libavutil/avstring.h new file mode 100644 index 0000000000..bc24ea14d1 --- /dev/null +++ b/libavutil/avstring.h @@ -0,0 +1,76 @@ +/* + * 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_STRING_H +#define AVUTIL_STRING_H + +#include + +/** + * 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 after the prefix in str in there is a match + * @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 after the prefix in str in there is a match + * @return non-zero if the prefix matches, zero otherwise + */ +int av_stristart(const char *str, const char *pfx, const char **ptr); + +/** + * 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 + */ +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 + */ +size_t av_strlcat(char *dst, const char *src, size_t size); + +#endif /* AVUTIL_STRING_H */ diff --git a/libavutil/string.c b/libavutil/string.c new file mode 100644 index 0000000000..20f89c7036 --- /dev/null +++ b/libavutil/string.c @@ -0,0 +1,58 @@ +/* + * 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 "avstring.h" + +int av_strstart(const char *str, const char *pfx, const char **ptr) +{ + while (*pfx && *pfx++ == *str++); + if (!*pfx && ptr) + *ptr = str; + return !*pfx; +} + +int av_stristart(const char *str, const char *pfx, const char **ptr) +{ + while (*pfx && toupper((unsigned)*pfx++) == toupper((unsigned)*str++)); + if (!*pfx && ptr) + *ptr = str; + return !*pfx; +} + +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); +} -- cgit v1.2.3