Switch operand implementation for the strings

switchs.h

#ifndef __SWITCHS_H__
#define __SWITCHS_H__

#include <string.h>
#include <regex.h>
#include <stdbool.h>

/** Begin a switch for the string x */
#define switchs(x) \
    { char *ss__sw = (x); bool ss__done = false; bool ss__cont = false; \
        regex_t ss__regex; regcomp(&ss__regex, ".*", 0); do {

/** Check if the string matches the cases argument (case sensitive) */
#define cases(x)    } if ( ss__cont || !strcmp ( ss__sw, x ) ) \
                        { ss__done = true; ss__cont = true;

/** Check if the string matches the icases argument (case insensitive) */
#define icases(x)    } if ( ss__cont || !strcasecmp ( ss__sw, x ) ) { \
                        ss__done = true; ss__cont = true;

/** Check if the string matches the specified regular expression using regcomp(3) */
#define cases_re(x,flags) } regfree ( &ss__regex ); if ( ss__cont || ( \
                              0 == regcomp ( &ss__regex, x, flags ) && \
                              0 == regexec ( &ss__regex, ss__sw, 0, NULL, 0 ) ) ) { \
                                ss__done = true; ss__cont = true;

/** Default behaviour */
#define defaults    } if ( !ss__done || ss__cont ) {

/** Close the switchs */
#define switchs_end } while ( 0 ); regfree(&ss__regex); }

#endif // __SWITCHS_H__

switchs_example.c

#include <stdio.h>
#include "switchs.h"

int main(int argc, char **argv) {
     switchs(argv[1]) {
        cases("foo")
        cases("bar")
            printf("foo or bar (case sensitive)\n");
            break;

        icases("pi")
            printf("pi or Pi or pI or PI (case insensitive)\n");
            break;

        cases_re("^D.*",0)
            printf("Something that start with D (case sensitive)\n");
            break;

        cases_re("^E.*",REG_ICASE)
            printf("Something that start with E (case insensitive)\n");
            break;

        cases("1")
            printf("1\n");

        cases("2")
            printf("2\n");
            break;

        defaults
            printf("No match\n");
            break;
    } switchs_end;
 
    return 0;
}

LOVE this. just comment out the regex line for embedded systems without glibc, etc!