116 lines
2.5 KiB
C
116 lines
2.5 KiB
C
/* sxiv: util.c
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* Copyright (c) 2011 Bert Muennich <muennich at informatik.hu-berlin.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include "options.h"
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#include "util.h"
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#define FNAME_LEN 512
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void cleanup();
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void* s_malloc(size_t size) {
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void *ptr;
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if (!(ptr = malloc(size)))
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die("could not allocate memory");
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return ptr;
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}
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void* s_realloc(void *ptr, size_t size) {
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if (!(ptr = realloc(ptr, size)))
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die("could not allocate memory");
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return ptr;
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}
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void warn(const char* fmt, ...) {
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va_list args;
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if (!fmt || options->quiet)
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return;
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va_start(args, fmt);
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fprintf(stderr, "sxiv: warning: ");
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vfprintf(stderr, fmt, args);
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fprintf(stderr, "\n");
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va_end(args);
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}
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void die(const char* fmt, ...) {
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va_list args;
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if (!fmt)
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return;
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va_start(args, fmt);
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fprintf(stderr, "sxiv: error: ");
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vfprintf(stderr, fmt, args);
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fprintf(stderr, "\n");
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va_end(args);
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cleanup();
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exit(1);
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}
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void size_readable(float *size, const char **unit) {
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const char *units[] = { "", "K", "M", "G" };
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int i;
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for (i = 0; i < LEN(units) && *size > 1024; ++i)
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*size /= 1024;
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*unit = units[MIN(i, LEN(units) - 1)];
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}
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char* readline(FILE *stream) {
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size_t len;
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char *buf, *s, *end;
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if (!stream || feof(stream) || ferror(stream))
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return NULL;
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len = FNAME_LEN;
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s = buf = (char*) s_malloc(len * sizeof(char));
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do {
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*s = '\0';
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fgets(s, len - (s - buf), stream);
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if ((end = strchr(s, '\n'))) {
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*end = '\0';
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} else if (strlen(s) + 1 == len - (s - buf)) {
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buf = (char*) s_realloc(buf, 2 * len * sizeof(char));
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s = buf + len - 1;
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len *= 2;
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} else {
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s += strlen(s);
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}
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} while (!end && !feof(stream) && !ferror(stream));
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if (ferror(stream)) {
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s = NULL;
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} else {
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s = (char*) s_malloc((strlen(buf) + 1) * sizeof(char));
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strcpy(s, buf);
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}
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free(buf);
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return s;
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}
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