diff options
Diffstat (limited to 'libavutil/bprint.c')
| -rw-r--r-- | libavutil/bprint.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/libavutil/bprint.c b/libavutil/bprint.c index 4684ab4979..fd7611aaed 100644 --- a/libavutil/bprint.c +++ b/libavutil/bprint.c @@ -23,6 +23,7 @@ #include <string.h> #include <time.h> #include "avassert.h" +#include "avstring.h" #include "bprint.h" #include "common.h" #include "error.h" @@ -217,6 +218,50 @@ int av_bprint_finalize(AVBPrint *buf, char **ret_str) return ret; } +#define WHITESPACES " \n\t" + +void av_bprint_escape(AVBPrint *dstbuf, const char *src, const char *special_chars, + enum AVEscapeMode mode, int flags) +{ + const char *src0 = src; + + if (mode == AV_ESCAPE_MODE_AUTO) + mode = AV_ESCAPE_MODE_BACKSLASH; /* TODO: implement a heuristic */ + + switch (mode) { + case AV_ESCAPE_MODE_QUOTE: + /* enclose the string between '' */ + av_bprint_chars(dstbuf, '\'', 1); + for (; *src; src++) { + if (*src == '\'') + av_bprintf(dstbuf, "'\\''"); + else + av_bprint_chars(dstbuf, *src, 1); + } + av_bprint_chars(dstbuf, '\'', 1); + break; + + /* case AV_ESCAPE_MODE_BACKSLASH or unknown mode */ + default: + /* \-escape characters */ + for (; *src; src++) { + int is_first_last = src == src0 || !*(src+1); + int is_ws = !!strchr(WHITESPACES, *src); + int is_strictly_special = special_chars && strchr(special_chars, *src); + int is_special = + is_strictly_special || strchr("'\\", *src) || + (is_ws && (flags & AV_ESCAPE_FLAG_WHITESPACE)); + + if (is_strictly_special || + (!(flags & AV_ESCAPE_FLAG_STRICT) && + (is_special || (is_ws && is_first_last)))) + av_bprint_chars(dstbuf, '\\', 1); + av_bprint_chars(dstbuf, *src, 1); + } + break; + } +} + #ifdef TEST #undef printf |