#include "lslib.h"

#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

long int get_number(const char* text) {
    char* end;
    long int n = strtol(text, &end, 10);
    if (text == end) {
        error("%s is not a valid number", text);
    }
    return n;
}

long int get_blkm(const char* text) {
    char* end;
    long int n = strtol(text, &end, 10);
    if (text == end) {
        error("%s is not a valid bkm", text);
    }
    if (*end == '\0') return n;
    switch (*end) {
        case 'K':
        case 'k':
            return n * 1024;
        case 'B':
        case 'b':
            return n * 512;
        case 'M':
        case 'm':
            return n * 1024 * 1204;
        default:
            error("invalid bkm type %c", *end);
    }
    
    /* shouldnt get here anyways */
    return 0;
}

mode_t get_mode(const char* next) {
    char* end = NULL;
    mode_t mode = (mode_t)strtol(next, &end, 8);
    if (!end) return 0;
    while(isspace(*end)) end++;
    if (*end != '\0' || (unsigned) mode >= 010000) {
        error("invalid file mode: `%s`", next);
    }
    return mode;
}

bool streql(const char* a, const char* b) {
    int n = 0;

    if (*a != *b) return false;
    
    while (true) {
        if (*(a+n) != *(b+n)) return false;
        if (*(a+n) == '\0') return true;
        ++n;
    }
}

bool prefix(const char* pre, const char* str) {
    return strncmp(pre, str, strlen(pre)) == 0;
}