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annotate getopt.c @ 0:c55ea9478c80

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Hello Gensokyo!
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Tue, 21 May 2013 10:29:21 +0200
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1 /*
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2 * getopt - get option letter from argv
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3 *
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4 * This is a version of the public domain getopt() implementation by
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5 * Henry Spencer, changed for 4.3BSD compatibility (in addition to System V).
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6 * It allows rescanning of an option list by setting optind to 0 before
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7 * calling, which is why we use it even if the system has its own (in fact,
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8 * this one has a unique name so as not to conflict with the system's).
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9 * Thanks to Dennis Ferguson for the appropriate modifications.
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10 *
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11 * This file is in the Public Domain.
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12 */
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13
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14 #include <string.h>
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15 #include <unistd.h>
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16
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17 char *optarg; /* Global argument pointer. */
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18 int optind = 0; /* Global argv index. */
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19 int opterr = 1; /* for compatibility, should error be printed? */
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20 int optopt; /* for compatibility, option character checked */
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21
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22 static char *scan = NULL; /* Private scan pointer. */
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23
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24 /*
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25 * Print message about a bad option.
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26 */
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27 static int badopt(const char *msg, int ch)
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28 {
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29 if (opterr) {
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30 write(2, msg, strlen(msg));
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31 write(2, &ch, 1);
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32 write(2, "\n", 1);
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33 }
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34 return ('?');
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35 }
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36
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37 int getopt(int argc, char *const argv[], const char *optstring)
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38 {
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39 register char c;
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40 register const char *place;
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41 optarg = NULL;
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42
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43 if (optind == 0) {
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44 scan = NULL;
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45 optind++;
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46 }
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47
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48 if (scan == NULL || *scan == '\0') {
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49 if (optind >= argc
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50 || argv[optind][0] != '-'
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51 || argv[optind][1] == '\0') {
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52 return (-1);
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53 }
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54 if (argv[optind][1] == '-'
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55 && argv[optind][2] == '\0') {
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56 optind++;
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57 return (-1);
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58 }
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59 scan = argv[optind++]+1;
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60 }
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61
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62 c = *scan++;
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63 optopt = c & 0377;
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64 for (place = optstring; place != NULL && *place != '\0'; ++place)
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65 if (*place == c)
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66 break;
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67
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68 if (place == NULL || *place == '\0' || c == ':' || c == '?') {
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69 return (badopt("getopt: unknown option -", c));
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70 }
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71
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72 place++;
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73 if (*place == ':') {
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74 if (*scan != '\0') {
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75 optarg = scan;
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76 scan = NULL;
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77 } else if (optind >= argc) {
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78 return (badopt("getopt: option requires argument -", c));
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79 } else {
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80 optarg = argv[optind++];
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81 }
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82 }
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83 return (c & 0377);
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84 }
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85