Home-made mini separator interpreter (Apache 2.0)

separator_parse.c

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


char * separator_parse(const char *sep);

int main(int argc, char *argv[])
{
    if (argc < 2) {
        fprintf(stderr, "No valid argument\n");
        return 1;
    }

    char *sep = separator_parse(argv[1]);

    printf("-->%s<--\n", sep);

    free(sep);

    return 0;
}

char * separator_parse(const char *sep)
{
    size_t size = strlen(sep);

    char *out = malloc((size + 1) * sizeof(char));

    size_t i = 0;
    size_t j = 0;
    while (j < size) {
        if (sep[j] == '\\') {
            // Last char in the sep string.
            if (j + 1 >= size) {
                out[i] = sep[j];
                break;
            }

            switch (sep[j+1]) {
            case '\\':
                out[i] = '\\';
                j++;
                break;
            case '\'':
                out[i] = '\'';
                j++;
                break;
            case '\"':
                out[i] = '\"';
                j++;
                break;
            case 'n':
                out[i] = '\n';
                j++;
                break;
            case 't':
                out[i] = '\t';
                j++;
                break;
            default:
                out[i] = sep[j];
                break;
            }
        }
        else {
            out[i] = sep[j];
        }

        i++; j++;
    }

    out[i+1] = '\0';

    return out;
}