annotate toys/which.c @ 295:5a0faa267866

Fix which (the meaning of -a was reversed, and it was finding the _last_ hit).
author Rob Landley <rob@landley.net>
date Sat, 17 May 2008 17:52:51 -0500
parents 163498bf547b
children d51be130fda2
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d4176f3f3835 Zap toys/Config.in and instead create generated/Config.in from contents of
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1 /* vi: set sw=4 ts=4:
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2 *
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bb6048c923ec Add or correct file descriptions
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3 * which.c - Find executable files in $PATH.
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4 *
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5 * Copyright 2006 Rob landley <rob@landley.net>
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30a6db5a95c2 Add comments about SUSv3 specs (or lack thereof).
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6 *
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7 * Not in SUSv3.
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8
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5a0faa267866 Fix which (the meaning of -a was reversed, and it was finding the _last_ hit).
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9 USE_WHICH(NEWTOY(which, "<1a", TOYFLAG_USR|TOYFLAG_BIN))
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163498bf547b Move NEWTOY() list from end of toylist.h to generated/newtoys.h.
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10
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11 config WHICH
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12 bool "which"
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13 default y
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14 help
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15 usage: which [-a] filename ...
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16
d4176f3f3835 Zap toys/Config.in and instead create generated/Config.in from contents of
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17 Search $PATH for executable files matching filename(s).
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18
d4176f3f3835 Zap toys/Config.in and instead create generated/Config.in from contents of
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19 -a Show all matches
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20 */
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21 #include "toys.h"
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22
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23 // Find an exectuable file either at a path with a slash in it (absolute or
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24 // relative to current directory), or in $PATH. Returns absolute path to file,
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25 // or NULL if not found.
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26
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27 static int which_in_path(char *filename)
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28 {
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29 struct string_list *list;
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30
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31 // If they gave us a path, don't worry about $PATH or -a
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32
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33 if (index(filename, '/')) {
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34 // Confirm it has the executable bit set, and it's not a directory.
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35 if (!access(filename, X_OK)) {
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36 struct stat st;
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37
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38 if (!stat(filename, &st) && S_ISREG(st.st_mode)) {
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39 puts(filename);
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40 return 0;
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41 }
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42 return 1;
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43 }
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44 }
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45
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46 // Search $PATH for matches.
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47 list = find_in_path(getenv("PATH"), filename);
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48 if (!list) return 1;
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49
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50 // Print out matches
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51 while (list) {
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52 if (!access(list->str, X_OK)) {
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53 puts(list->str);
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54 // If we should stop at one match, do so
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55 if (!toys.optflags) {
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56 llist_free(list, NULL);
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57 break;
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58 }
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59 }
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60 free(llist_pop(&list));
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61 }
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62
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63 return 0;
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64 }
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65
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25447caf1b4b Change command main() functions to return void, and exit(toys.exitval) from
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66 void which_main(void)
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67 {
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68 int i;
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69 for (i=0; toys.optargs[i]; i++)
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70 toys.exitval |= which_in_path(toys.optargs[i]);
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71 }