annotate toys/which.c @ 151:bb6048c923ec

Add or correct file descriptions
author Charlie Shepherd <masterdriverz@gentoo.org>
date Tue, 06 Nov 2007 20:47:18 +0000
parents 7c77c6ec17ee
children 25447caf1b4b
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3981c96f9285 Implement which. Add hello world to menuconfig. Wrap the various applet main
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1 /* vi: set sw=4 ts=4: */
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2 /*
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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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6 */
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7
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8 #include "toys.h"
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9
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10 #define OPT_a 1
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12 // Find an exectuable file either at a path with a slash in it (absolute or
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13 // relative to current directory), or in $PATH. Returns absolute path to file,
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14 // or NULL if not found.
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15
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16 static int which_in_path(char *filename)
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17 {
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18 struct string_list *list;
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19
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20 // If they gave us a path, don't worry about $PATH or -a
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22 if (index(filename, '/')) {
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23 // Confirm it has the executable bit set, and it's not a directory.
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24 if (!access(filename, X_OK)) {
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25 struct stat st;
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27 if (!stat(filename, &st) && S_ISREG(st.st_mode)) {
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28 puts(filename);
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29 return 0;
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30 }
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31 return 1;
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32 }
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33 }
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34
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35 // Search $PATH for matches.
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36 list = find_in_path(getenv("PATH"), filename);
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37 if (!list) return 1;
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38
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39 // Print out matches
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40 while (list) {
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41 if (!access(list->str, X_OK)) {
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42 puts(list->str);
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43 // If we should stop at one match, do so
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44 if (toys.optflags & OPT_a) {
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45 llist_free(list, NULL);
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46 break;
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47 }
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48 }
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49 free(llist_pop(&list));
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50 }
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51
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52 return 0;
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53 }
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54
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55 int which_main(void)
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56 {
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57 int rc = 0;
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58
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59 if (!*toys.optargs) rc++;
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60 else {
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61 int i;
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62 for (i=0; toys.optargs[i]; i++) rc |= which_in_path(toys.optargs[i]);
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63 }
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64 // if (CFG_TOYBOX_FREE) free(argv);
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66 return rc;
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67 }