diff options
Diffstat (limited to 'src/basic/escape.c')
| -rw-r--r-- | src/basic/escape.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/src/basic/escape.c b/src/basic/escape.c index 75a1d68..2067be4 100644 --- a/src/basic/escape.c +++ b/src/basic/escape.c @@ -451,6 +451,12 @@ char* octescape(const char *s, size_t len) { assert(s || len == 0); + if (len == SIZE_MAX) + len = strlen(s); + + if (len > (SIZE_MAX - 1) / 4) + return NULL; + t = buf = new(char, len * 4 + 1); if (!buf) return NULL; @@ -471,6 +477,33 @@ char* octescape(const char *s, size_t len) { return buf; } +char* decescape(const char *s, const char *bad, size_t len) { + char *buf, *t; + + /* Escapes all chars in bad, in addition to \ and " chars, in \nnn decimal style escaping. */ + + assert(s || len == 0); + + t = buf = new(char, len * 4 + 1); + if (!buf) + return NULL; + + for (size_t i = 0; i < len; i++) { + uint8_t u = (uint8_t) s[i]; + + if (u < ' ' || u >= 127 || IN_SET(u, '\\', '"') || strchr(bad, u)) { + *(t++) = '\\'; + *(t++) = '0' + (u / 100); + *(t++) = '0' + ((u / 10) % 10); + *(t++) = '0' + (u % 10); + } else + *(t++) = u; + } + + *t = 0; + return buf; +} + static char* strcpy_backslash_escaped(char *t, const char *s, const char *bad) { assert(bad); assert(t); |