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	parseoffset.c - sbase - suckless unix tools
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	parseoffset.c (1148B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <ctype.h>
	3 #include <errno.h>
	4 #include <inttypes.h>
	5 #include <stdlib.h>
	6 #include <string.h>
	7
	8 #include "../util.h"
	9
	10 off_t
	11 parseoffset(const char *str)
	12 {
	13 off_t res, scale = 1;
	14 char *end;
	15
	16 /* strictly check what strtol() usually would let pass */
	17 if (!str \|\| !str \|\| isspace(str) \|\| str == '+' \|\| str == '-'…
	18 weprintf("parseoffset %s: invalid value\n", str);
	19 return -1;
	20 }
	21
	22 errno = 0;
	23 res = strtol(str, &end, 0);
	24 if (errno) {
	25 weprintf("parseoffset %s: invalid value\n", str);
	26 return -1;
	27 }
	28 if (res < 0) {
	29 weprintf("parseoffset %s: negative value\n", str);
	30 return -1;
	31 }
	32
	33 /* suffix */
	34 if (*end) {
	35 switch (toupper((int)*end)) {
	36 case 'B':
	37 scale = 512L;
	38 break;
	39 case 'K':
	40 scale = 1024L;
	41 break;
	42 case 'M':
	43 scale = 1024L * 1024L;
	44 break;
	45 case 'G':
	46 scale = 1024L * 1024L * 1024L;
	47 break;
	48 default:
	49 weprintf("parseoffset %s: invalid suffix '%s'\n"…
	50 return -1;
	51 }
	52 }
	53
	54 /* prevent overflow */
	55 if (res > (SSIZE_MAX / scale)) {
	56 weprintf("parseoffset %s: out of range\n", str);
	57 return -1;
	58 }
	59
	60 return res * scale;
	61 }