62 lines
1.1 KiB
C
62 lines
1.1 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <ctype.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <stdlib.h>
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#include <string.h>
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#include "../util.h"
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off_t
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parseoffset(const char *str)
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{
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off_t res, scale = 1;
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char *end;
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/* strictly check what strtol() usually would let pass */
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if (!str || !*str || isspace(*str) || *str == '+' || *str == '-') {
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weprintf("parseoffset %s: invalid value\n", str);
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return -1;
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}
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errno = 0;
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res = strtol(str, &end, 0);
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if (errno) {
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weprintf("parseoffset %s: invalid value\n", str);
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return -1;
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}
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if (res < 0) {
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weprintf("parseoffset %s: negative value\n", str);
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return -1;
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}
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/* suffix */
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if (*end) {
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switch (toupper((int)*end)) {
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case 'B':
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scale = 512L;
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break;
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case 'K':
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scale = 1024L;
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break;
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case 'M':
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scale = 1024L * 1024L;
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break;
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case 'G':
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scale = 1024L * 1024L * 1024L;
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break;
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default:
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weprintf("parseoffset %s: invalid suffix '%s'\n", str, end);
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return -1;
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}
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}
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/* prevent overflow */
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if (res > (SSIZE_MAX / scale)) {
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weprintf("parseoffset %s: out of range\n", str);
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return -1;
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}
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return res * scale;
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}
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