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authorUlrich Drepper <drepper@redhat.com>2001-12-14 22:17:03 +0000
committerUlrich Drepper <drepper@redhat.com>2001-12-14 22:17:03 +0000
commit638621aff981fc5e9e5824d04c67ef2a7dfa4744 (patch)
treef81d717e5260b86d984b4767bcdecd48be253f30 /sysdeps
parent0ce9cf883db2ec6bf8854828b4b57d03e050c5f2 (diff)
downloadglibc-638621aff981fc5e9e5824d04c67ef2a7dfa4744.zip
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Update.
* sysdeps/generic/strstr.c (strstr): Update. New optimized version.
Diffstat (limited to 'sysdeps')
-rw-r--r--sysdeps/generic/strstr.c121
1 files changed, 58 insertions, 63 deletions
diff --git a/sysdeps/generic/strstr.c b/sysdeps/generic/strstr.c
index 1409fbd..ff295e0 100644
--- a/sysdeps/generic/strstr.c
+++ b/sysdeps/generic/strstr.c
@@ -1,5 +1,5 @@
/* Return the offset of one string within another.
- Copyright (C) 1994, 1996, 1997, 2000 Free Software Foundation, Inc.
+ Copyright (C) 1994, 1996, 1997, 2000, 2001 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -43,85 +43,80 @@ strstr (phaystack, pneedle)
const char *phaystack;
const char *pneedle;
{
- register const unsigned char *haystack, *needle;
- register chartype b, c;
+ const unsigned char *haystack, *needle;
+ chartype b;
+ const unsigned char *rneedle;
haystack = (const unsigned char *) phaystack;
- needle = (const unsigned char *) pneedle;
- b = *needle;
- if (b != '\0')
+ if (b = *(needle = (const unsigned char *) pneedle))
{
- haystack--; /* possible ANSI violation */
- do
- {
- c = *++haystack;
- if (c == '\0')
+ chartype c;
+ haystack--; /* possible ANSI violation */
+
+ {
+ chartype a;
+ do
+ if (!(a = *++haystack))
goto ret0;
- }
- while (c != b);
+ while (a != b);
+ }
- c = *++needle;
- if (c == '\0')
+ if (!(c = *++needle))
goto foundneedle;
++needle;
goto jin;
for (;;)
- {
- register chartype a;
- register const unsigned char *rhaystack, *rneedle;
-
- do
- {
- a = *++haystack;
- if (a == '\0')
- goto ret0;
- if (a == b)
- break;
+ {
+ {
+ chartype a;
+ if (0)
+ jin:{
+ if ((a = *++haystack) == c)
+ goto crest;
+ }
+ else
a = *++haystack;
- if (a == '\0')
- goto ret0;
-shloop:
- ;
- }
- while (a != b);
-
-jin: a = *++haystack;
- if (a == '\0')
- goto ret0;
-
- if (a != c)
- goto shloop;
-
- rhaystack = haystack-- + 1;
- rneedle = needle;
- a = *rneedle;
-
- if (*rhaystack == a)
do
{
- if (a == '\0')
- goto foundneedle;
- ++rhaystack;
- a = *++needle;
- if (*rhaystack != a)
- break;
- if (a == '\0')
- goto foundneedle;
- ++rhaystack;
- a = *++needle;
+ for (; a != b; a = *++haystack)
+ {
+ if (!a)
+ goto ret0;
+ if ((a = *++haystack) == b)
+ break;
+ if (!a)
+ goto ret0;
+ }
}
- while (*rhaystack == a);
-
- needle = rneedle; /* took the register-poor approach */
-
- if (a == '\0')
- break;
- }
+ while ((a = *++haystack) != c);
+ }
+ crest:
+ {
+ chartype a;
+ {
+ const unsigned char *rhaystack;
+ if (*(rhaystack = haystack-- + 1) == (a = *(rneedle = needle)))
+ do
+ {
+ if (!a)
+ goto foundneedle;
+ if (*++rhaystack != (a = *++needle))
+ break;
+ if (!a)
+ goto foundneedle;
+ }
+ while (*++rhaystack == (a = *++needle));
+ needle = rneedle; /* took the register-poor aproach */
+ }
+ if (!a)
+ break;
+ }
+ }
}
foundneedle:
- return (char*) haystack;
+ return (char *) haystack;
ret0:
return 0;
}