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annotate libutil/shorthand.c @ 170:13b8d90eb5c7

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doc/Brute-force-search article written
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 01 Mar 2021 00:25:49 +0000
parents b86b3f8890ba
children
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1 /*
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2 * This module implements the function for parsing shorthand decimal strings.
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3 */
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4
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5 #include <sys/types.h>
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6 #include <ctype.h>
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7 #include <stdio.h>
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8 #include <string.h>
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9 #include <strings.h>
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10
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11 parse_decimal_shorthand(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, ntail;
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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 if (!isdigit(*arg)) {
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24 fprintf(stderr,
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25 "error: decimal string argument begins with a non-digit\n");
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26 return(-1);
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27 }
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28 for (n = 0; isdigit(*arg); ) {
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29 if (n >= maxdigits) {
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30 toolong: 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 if (!*arg) {
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38 if (n != maxdigits) {
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39 fprintf(stderr,
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40 "error: %u digits required, %u digits given\n",
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41 maxdigits, n);
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42 return(-1);
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43 }
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44 return(0);
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45 }
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46 if (*arg++ != '-') {
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47 malformed: fprintf(stderr,
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48 "error: malformed shorthand decimal string argument\n");
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49 return(-1);
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50 }
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51 ntail = strlen(arg);
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52 if (n + ntail >= maxdigits)
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53 goto toolong;
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54 while (n < maxdigits - ntail)
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55 dest[n++] = 0;
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56 if (!isdigit(*arg))
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57 goto malformed;
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58 while (*arg) {
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59 if (!isdigit(*arg))
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60 goto malformed;
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61 dest[n++] = *arg++ - '0';
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62 }
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63 return(0);
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64 }