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-rw-r--r--libc/string/i386/string.c19
1 files changed, 13 insertions, 6 deletions
diff --git a/libc/string/i386/string.c b/libc/string/i386/string.c
index 779087aed..8a7f1a89b 100644
--- a/libc/string/i386/string.c
+++ b/libc/string/i386/string.c
@@ -48,12 +48,15 @@ char * strncpy(char * dest, const char * src, size_t count)
{
int d0, d1, d2, d3;
__asm__ __volatile__(
- "1:\tdecl %2\n\t"
- "js 2f\n\t"
+ "incl %2\n"
+ "1:\n"
+ "decl %2\n"
+ "jz 2f\n"
"lodsb\n\t"
"stosb\n\t"
"testb %%al,%%al\n\t"
"jne 1b\n\t"
+ "decl %2\n"
"rep\n\t"
"stosb\n"
"2:"
@@ -93,14 +96,17 @@ char *strncat(char * dest,
"scasb\n\t"
"decl %1\n\t"
"movl %8,%3\n"
+ "incl %3\n"
"1:\tdecl %3\n\t"
- "js 2f\n\t"
+ "jz 2f\n"
"lodsb\n\t"
"stosb\n\t"
"testb %%al,%%al\n\t"
"jne 1b\n"
+ "jmp 3f\n"
"2:\txorl %2,%2\n\t"
- "stosb"
+ "stosb\n"
+ "3:"
: "=&S" (d0), "=&D" (d1), "=&a" (d2), "=&c" (d3)
: "0" (src),"1" (dest),"2" (0),"3" (0xffffffff), "g" (count)
: "memory");
@@ -141,8 +147,9 @@ int strncmp(const char *cs, const char *ct, size_t count)
register int __res;
int d0, d1, d2;
__asm__ __volatile__(
+ "incl %3\n"
"1:\tdecl %3\n\t"
- "js 2f\n\t"
+ "jz 2f\n"
"lodsb\n\t"
"scasb\n\t"
"jne 3f\n\t"
@@ -226,12 +233,12 @@ size_t strnlen(const char *s, size_t count)
register int __res;
__asm__ __volatile__(
"movl %2,%0\n\t"
+ "incl %1\n"
"jmp 2f\n"
"1:\tcmpb $0,(%0)\n\t"
"je 3f\n\t"
"incl %0\n"
"2:\tdecl %1\n\t"
- "cmpl $-1,%1\n\t"
"jne 1b\n"
"3:\tsubl %2,%0"
:"=a" (__res), "=&d" (d0)