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43 lines (38 loc) · 856 Bytes
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Copy pathstrncasecmp.c
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43 lines (38 loc) · 856 Bytes
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/* from Henry Spencer's stringlib */
/* revised by ERS */
#include <string.h>
#include <ctype.h>
#include <compiler.h>
/*
* strncmp - compare at most n characters of string s1 to s2
*/
int /* <0 for <, 0 for ==, >0 for > */
strncasecmp(const char *scan1, 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 = toupper(*scan1++);
c2 = toupper(*scan2++);
} 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);
}