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Compare two strings, ignoring case, up to a given length
#include <strings.h>
int strncasecmp( const char* str1,
const char* str2,
size_t n );
- str1, str2
- The strings that you want to compare.
- n
- The maximum number of characters that you want to compare.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The strncasecmp() function compares up to n characters
in two strings, specified by str1 and str2,
ignoring the case of the characters.
- < 0
- s1 is less than s2.
- 0
- s1 is equal to s2.
- > 0
- s1 is greater than s2.
The following code:
#include <stdio.h>
#include <strings.h>
#include <stdlib.h>
void compare( const char *s1, const char *s2 )
{
int retval;
retval = strncasecmp( s1, s2, 3 );
if( retval > 0 ) {
printf( "%s > %s\n", s1, s2 );
} else if( retval < 0 ) {
printf( "%s < %s\n", s1, s2 );
} else {
printf( "%s == %s\n", s1, s2 );
}
}
int main( void )
{
char *str1 = "abcdefg";
char *str2 = "HIJ";
char *str3 = "Abc";
char *str4 = "aBCDEfg";
compare( str1, str2 );
compare( str1, str3 );
compare( str1, str4 );
compare( str1, str1 );
compare( str2, str2 );
compare( str2, str3 );
compare( str2, str4 );
compare( str2, str1 );
return EXIT_SUCCESS;
}
produces output that looks like:
abcdefg < HIJ
abcdefg == Abc
abcdefg == aBCDEfg
abcdefg == abcdefg
HIJ == HIJ
HIJ > Abc
HIJ > aBCDEfg
HIJ > abcdefg
POSIX 1003.1 XSI
Safety: | |
Cancellation point |
No |
Interrupt handler |
Yes |
Signal handler |
Yes |
Thread |
Yes |
strcasecmp(),
strcmp(),
strcmpi(),
strcoll(),
stricmp(),
strncmp(),
strnicmp(),
wcscmp(),
wcscoll(),
wcsncmp()
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