source: MondoRescue/branches/stable/mondo/mondo/common/mr_string.c@ 828

// New generation of string handling functions


// Safe alternative to standard function strok()
char *mr_strtok(char *instr, const char *delims, int *lastpos)
{

    char *token = NULL;
    char *strptr = NULL;
    size_t pos1 = 0;
    size_t pos2 = 0;

    if (strlen(instr) <= *lastpos) {
        *lastpos = 0;
        return token;
    }

    strptr = instr + *lastpos;
    pos2 = strspn(strptr, delims);
    strptr += pos2;
    pos1 = strcspn(strptr, delims);
    token = malloc(sizeof(*token) * (pos1 + 1));
    strncpy(token, strptr, pos1);
    token[pos1] = '\0';
    *lastpos = *lastpos + pos1 + pos2 + 1;

    return token;
}


// Returns the string fed to it 'inptr' with all characters to escape given
// in 'toesc' prepended by escaping character 'escchr'.
// (Prepare strings for use in system() or popen() with this function.)
char *mr_stresc(char *instr, char *toesc, const char escchr)
{

    char *inptr = NULL;
    char *retstr = NULL;
    char *retptr = NULL;
    char *escptr = NULL;
    int cnt = 0;

    inptr = instr;

    // Count how many characters need escaping.
    while (*inptr != '\0') {
        escptr = toesc;
        while (*escptr != '\0') {
            if (*inptr == *escptr) {
                // Found it, skip the rest.
                cnt++;
                break;
            }
            inptr++;
            escptr++;
        }
    }
    inptr = instr;

    retstr = (char *) malloc(strlen(inptr) + cnt + 1);
    retptr = retstr;

    // Prepend specified characters with escape character.
    while (*inptr != '\0') {
        escptr = toesc;
        while (*escptr != '\0') {
            if (*inptr == *escptr) {
                // Found it, skip the rest.
                *retptr = escchr;
                retptr++;
                break;
            }
            escptr++;
        }
        *retptr = *inptr;
        retptr++;
        inptr++;
    }
    *retptr = '\0';

    return retstr;

}