utils.c

/*
 * A variety of utility functions.
 *
 * See utils.h for more info
 *
 * This is free and unencumbered software released into the public domain.
 * http://unlicense.org/
 */
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>

/* Case insensitive strcmp()
 */
int my_stricmp(const char *p, const char *q) {
    for(;*p && tolower(*p) == tolower(*q); p++, q++);
    return tolower(*p) - tolower(*q);
}

/* strdup() is not ANSI C */
char *my_strdup(const char *s) {
    char *a;
    size_t len = strlen(s);
    a = malloc(len + 1);
    if(!a) return NULL;
    memcpy(a, s, len + 1);
    return a;
}

/* converts a string to lowercase */
char *my_strlower (char *p) {
  char *s;
  for (s = p; s[0]; s++)
    s[0] = tolower (s[0]);

  return p;
}

/* converts a string to lowercase */
char *my_strupper (char *p)
{
  char *s;
  for (s = p; s[0]; s++)
    s[0] = toupper (s[0]);

  return p;
}

char *my_strtok_r(char *str, const char *delim, char **saveptr) {
    char *s;
    if(!str)
        str = *saveptr;
    if(!str[0]) {
        *saveptr = str;
        return NULL;
    }
    s = strpbrk(str, delim);
    if(s) {
        s[0] = '\0';
        *saveptr = s + 1;
        while((*saveptr)[0] && strchr(delim, (*saveptr)[0]))
            (*saveptr)++;
    } else
        for(*saveptr = str; (*saveptr)[0]; (*saveptr)++);
    return str;
}

/* Reads an entire file into a dynamically allocated memory buffer.
 * The returned buffer needs to be free()d afterwards
 */
char *my_readfile(const char *fname) {
    FILE *f;
    long len,r;
    char *str;

    if(!(f = fopen(fname, "rb")))
        return NULL;

    fseek(f, 0, SEEK_END);
    len = ftell(f);
    rewind(f);

    if(!(str = malloc(len+2)))
        return NULL;
    r = fread(str, 1, len, f);

    if(r != len) {
        free(str);
        return NULL;
    }

    fclose(f);
    str[len] = '\0';
    return str;
}