60 lines
959 B
C
60 lines
959 B
C
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/* See LICENSE file for copyright and license details. */
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#include <ctype.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;
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size_t scale;
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int base = 10;
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char *end;
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/* bases */
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if (!strncasecmp(str, "0x", strlen("0x"))) {
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base = 16;
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} else if (*str == '0') {
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str++;
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base = 8;
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}
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res = strtol(str, &end, base);
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if (res < 0) {
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weprintf("invalid file offset: %s\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("invalid file offset suffix: %s\n", str);
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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 > (SIZE_MAX / scale)) {
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weprintf("file offset out of range: %s\n", str);
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return -1;
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}
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return res;
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}
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