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C programming/C reference/nonstandard/strncasecmp
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C programming language offers a function called strncasecmp that compares the first n characters of a string with the other irrespective of the case of characters. strncasecmp is found in string.h header file.
syntax
int strncasecmp(const char *f1, const char *f2, size_t n );
The return value of this function is same as that of strcasecmp i.e it returns 0 if f1 and f2 are equal, a positive integer if f1 is found greater than f2 or a negative integer if f1 is found less than f2.
Example
# include <stdio.h>
# include <string.h>
# include <stdlib.h>
int main(int argc, char *argv[]){
int i;
if(argc != 4){
printf("bad input\n");
return 1;
}
i = strncasecmp(argv[1], argv[2], atoi(argv[3]));
if (i == 0)
printf("'%s' equals '%s'\n", argv[1], argv[2]);
else if (i > 0)
printf("'%s' is greater than '%s'\n", argv[1], argv[2]);
else if (i < 0)
printf("'%s' is less than '%s'\n", argv[1], argv[2]);
return 0;
}