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Implement strlen strdup strcmp

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1446 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2001-12-13 00:44:09 +00:00
parent e7c6f726c8
commit 75ad704490
1 changed files with 35 additions and 0 deletions
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35
tools/lli/RuntimeLib.lc
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@ -141,6 +141,41 @@ long int atol(const char *nptr) {
}
unsigned strlen(const char *Str) {
int Count = 0;
while (*Str) { ++Count; ++Str; }
return Count;
}
char *strdup(const char *str) {
int Len = strlen(str);
char *Result = (char*)malloc((Len+1)*sizeof(char));
memcpy(Result, str, Len+1);
return Result;
}
/* Compare S1 and S2, returning less than, equal to or
greater than zero if S1 is lexicographically less than,
equal to or greater than S2. */
int strcmp (const char *p1, const char *p2) {
register const unsigned char *s1 = (const unsigned char *) p1;
register const unsigned char *s2 = (const unsigned char *) p2;
unsigned char c1, c2;
do
{
c1 = (unsigned char) *s1++;
c2 = (unsigned char) *s2++;
if (c1 == '\0')
return c1 - c2;
}
while (c1 == c2);
return c1 - c2;
}
//===----------------------------------------------------------------------===//
// memory stuff...
//===----------------------------------------------------------------------===//