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annotate libutil/decimal_str.c @ 229:ed8cb3c0d312 default tip

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new README, indicating repository move
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 14 Mar 2021 18:26:13 +0000
parents 2557012666ea
children
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1 /*
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2 * This module implements some functions for initial parsing of decimal
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3 * string arguments, intended for implementation of commands like
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4 * write-iccid and write-imsi.
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5 */
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6
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7 #include <sys/types.h>
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8 #include <ctype.h>
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9 #include <stdio.h>
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10
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11 parse_decimal_string_arg(arg, dest, maxdigits)
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12 char *arg;
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13 u_char *dest;
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14 unsigned maxdigits;
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15 {
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16 unsigned n, ndig;
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17
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18 if (!*arg) {
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19 fprintf(stderr,
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20 "error: empty argument given for decimal string\n");
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21 return(-1);
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22 }
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23 for (n = 0; *arg; ) {
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24 if (!isdigit(*arg)) {
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25 fprintf(stderr,
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26 "error: non-digit char in decimal string argument\n");
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27 return(-1);
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28 }
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29 if (n >= maxdigits) {
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30 fprintf(stderr,
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31 "error: decimal string exceeds limit of %u digits\n",
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32 maxdigits);
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33 return(-1);
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34 }
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35 dest[n++] = *arg++ - '0';
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36 }
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37 ndig = n;
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38 while (n < maxdigits)
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39 dest[n++] = 0xF;
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40 return ndig;
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41 }