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authorDenys Vlasenko2010-10-23 21:06:06 +0200
committerDenys Vlasenko2010-10-23 21:06:06 +0200
commit53600591311a129717abd2e3bcaa302622a6ce67 (patch)
tree4b0d08ed429d4b73a9739339e74d84a8a72fe25e /libbb/process_escape_sequence.c
parent6a0d7490ea6ad97aeafb9da04acab13bd3c38e4d (diff)
downloadbusybox-53600591311a129717abd2e3bcaa302622a6ce67.zip
busybox-53600591311a129717abd2e3bcaa302622a6ce67.tar.gz
libbb: introduce and use strcpy_and_process_escape_sequences
function old new delta strcpy_and_process_escape_sequences - 50 +50 bb_process_escape_sequence 148 138 -10 printf_main 789 776 -13 getty_main 1897 1831 -66 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 0/3 up/down: 50/-89) Total: -39 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'libbb/process_escape_sequence.c')
-rw-r--r--libbb/process_escape_sequence.c44
1 files changed, 30 insertions, 14 deletions
diff --git a/libbb/process_escape_sequence.c b/libbb/process_escape_sequence.c
index 82cbe10..dd6e076 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++;
+ }
+}