Updated: April 19, 2023 |
Compare two strings, ignoring case
#include <strings.h> int strcasecmp( const char* str1, const char* str2 );
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The strcasecmp() function compares two strings, specified by str1 and str2, ignoring the case of the characters.
#include <stdio.h> #include <strings.h> #include <stdlib.h> void compare( const char* s1, const char* s2 ) { int retval; retval = strcasecmp( s1, s2 ); 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; }
This code produces output that looks like:
abcdefg < HIJ abcdefg > Abc abcdefg == aBCDEfg abcdefg == abcdefg HIJ == HIJ HIJ > Abc HIJ > aBCDEfg HIJ > abcdefg
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | Yes |
Signal handler | Yes |
Thread | Yes |