psh/src/icmd.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>

#include "icmd.h"
#include "common.h"


#define ICMDS_SIZE                                  \
    (sizeof(g_icmds) / sizeof(g_icmds[0]))

#define ICMD(name)                                  \
    {                                               \
        .cmd = TOSTR(name),                         \
        .len = sizeof(TOSTR(name))-1,               \
        .func = CONCAT(icmd_, name),                \
    }


struct icmd g_icmds[] =
{
    ICMD(exit),
    ICMD(cd),
    ICMD(ls),
};


int
call_icmds(char *line)
{
    size_t i;

    for (i = 0; i < ICMDS_SIZE; i++)
    {
        printf("cmp: '%s' : '%s' with len %d \n", g_icmds[i].cmd, line, g_icmds[i].len);
        if (strncmp(g_icmds[i].cmd, line, g_icmds[i].len) == 0)
            return g_icmds[i].func(line);
    }

    /* todo: find better way to signal this? */
    /*       maybe return function pointer? */
    return INT_MAX;
}


int
icmd_exit(char *line)
{
    printf("exiting with reason: %s", line);
    exit(0);
}


int
icmd_cd(char *line)
{
    printf("I'm a cd! line: %s\n", line);
    return 0;
}


int
icmd_ls(char *line)
{
    printf("I'm a ls! line: %s\n", line);
    return 1;
}