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update24.zoo
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lib
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strnicmp.c
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C/C++ Source or Header
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1992-08-14
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1KB
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52 lines
/* derived from strncmp from Henry Spencer's stringlib */
/* revised by ERS */
/* i-changes by Alexander Lehmann */
#include <string.h>
#include <ctype.h>
/*
* strnicmp - compare at most n characters of string s1 to s2 without case
* result is equivalent to strcmp(strupr(s1),s2)),
* but doesn't change anything
*/
asm(".stabs \"_strncmpi\",5,0,0,_strnicmp"); /* dept of clean tricks */
int /* <0 for <, 0 for ==, >0 for > */
strnicmp(scan1, scan2, n)
register const char *scan1;
register const char *scan2;
size_t n;
{
register char c1, c2;
register long count;
if (!scan1) {
return scan2 ? -1 : 0;
}
if (!scan2) return 1;
count = n;
do {
c1 = *scan1++; c1=toupper(c1);
c2 = *scan2++; c2=toupper(c2);
} while (--count >= 0 && c1 && c1 == c2);
if (count < 0)
return(0);
/*
* The following case analysis is necessary so that characters
* which look negative collate low against normal characters but
* high against the end-of-string NUL.
*/
if (c1 == c2)
return(0);
else if (c1 == '\0')
return(-1);
else if (c2 == '\0')
return(1);
else
return(c1 - c2);
}