util.c

/*
 * Copyright (c) 2010 Lenka Trochtova
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdlib.h>
#include <str.h>

#include "util.h"

char *get_abs_path(const char *base_path, const char *name, const char *ext)
{
        char *res;
        int base_len = str_size(base_path);
        int size = base_len + 2 * str_size(name) + str_size(ext) + 3;
        
        res = malloc(size);
        
        if (res) {
                str_cpy(res, size, base_path);
                if (base_path[base_len - 1] != '/')
                        str_append(res, size, "/");
                str_append(res, size, name);
                str_append(res, size, "/");
                str_append(res, size, name);
                if (ext[0] != '.')
                        str_append(res, size, ".");
                str_append(res, size, ext);
        }
        
        return res;
}

char *get_path_elem_end(char *path)
{
        while (*path != '\0' && *path != '/')
                path++;
        return path;
}

bool skip_spaces(char **buf)
{
        while (isspace(**buf))
                (*buf)++;
        return *buf != 0;
}

size_t get_nonspace_len(const char *str)
{
        size_t len = 0;
        
        while(*str != '\0' && !isspace(*str)) {
                len++;
                str++;
        }

        return len;
}

void free_not_null(const void *ptr)
{
        if (ptr != NULL)
                free(ptr);
}

char *clone_string(const char *s)
{
        size_t size = str_size(s) + 1;
        char *str;
        
        str = (char *) malloc(size);
        if (str != NULL)
                str_cpy(str, size, s);
        return str;
}

void replace_char(char *str, char orig, char repl)
{
        while (*str) {
                if (*str == orig)
                        *str = repl;
                str++;
        }
}

ssize_t safe_read(int fd, void *buffer, size_t size)
{
        if (size == 0) {
                return 0;
        }

        uint8_t *buf_ptr = (uint8_t *) buffer;

        size_t total_read = 0;
        while (total_read < size) {
                ssize_t bytes_read = read(fd, buf_ptr, size - total_read);
                if (bytes_read < 0) {
                        /* Error. */
                        return bytes_read;
                } else if (bytes_read == 0) {
                        /* Possibly end of file. */
                        break;
                } else {
                        /* Read at least something. */
                        buf_ptr += bytes_read;
                        total_read += bytes_read;
                }
        }

        return (ssize_t) total_read;
}

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