diff options
Diffstat (limited to 'libbb/process_escape_sequence.c')
| -rw-r--r-- | libbb/process_escape_sequence.c | 44 |
1 files changed, 30 insertions, 14 deletions
diff --git a/libbb/process_escape_sequence.c b/libbb/process_escape_sequence.c index 82cbe10dc..dd6e076b0 100644 --- a/libbb/process_escape_sequence.c +++ b/libbb/process_escape_sequence.c @@ -31,14 +31,13 @@ char FAST_FUNC bb_process_escape_sequence(const char **ptr) unsigned num_digits; unsigned r; unsigned n; - unsigned d; unsigned base; num_digits = n = 0; base = 8; q = *ptr; -#ifdef WANT_HEX_ESCAPES +#if WANT_HEX_ESCAPES if (*q == 'x') { ++q; base = 16; @@ -50,20 +49,21 @@ char FAST_FUNC bb_process_escape_sequence(const char **ptr) * \02 works, \2 does not (prints \ and 2). * We treat \2 as a valid octal escape sequence. */ do { - d = (unsigned char)(*q) - '0'; -#ifdef WANT_HEX_ESCAPES - if (d >= 10) { - d = (unsigned char)(_tolower(*q)) - 'a' + 10; - } +#if !WANT_HEX_ESCAPES + unsigned d = (unsigned char)(*q) - '0'; +#else + unsigned d = (unsigned char)_tolower(*q) - '0'; + if (d >= 10) + d += ('0' - 'a' + 10); #endif - if (d >= base) { -#ifdef WANT_HEX_ESCAPES - if ((base == 16) && (!--num_digits)) { -/* return '\\'; */ - --q; + if (WANT_HEX_ESCAPES && base == 16) { + --num_digits; + if (num_digits == 0) { + /* \x<bad_char> */ + --q; /* go back to x */ + } } -#endif break; } @@ -85,7 +85,9 @@ char FAST_FUNC bb_process_escape_sequence(const char **ptr) } } while (*++p); /* p points to found escape char or NUL, - * advance it and find what it translates to */ + * advance it and find what it translates to. + * Note that unrecognized sequence \z returns '\' + * and leaves ptr pointing to z. */ p += sizeof(charmap) / 2; n = *p; } @@ -94,3 +96,17 @@ char FAST_FUNC bb_process_escape_sequence(const char **ptr) return (char) n; } + +char* FAST_FUNC strcpy_and_process_escape_sequences(char *dst, const char *src) +{ + while (1) { + char c, c1; + c = c1 = *src++; + if (c1 == '\\') + c1 = bb_process_escape_sequence(&src); + *dst = c1; + if (c == '\0') + return dst; + dst++; + } +} |