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annotate toys/other/which.c @ 1310:7baa19cdce59 draft

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Remove debug detritus I didn't mean to to check in, and treat an "this variable can never actually be used uninitialized but gcc's warning generator can't tell and fails spamwards" warning.
author Rob Landley <rob@landley.net>
date Sat, 24 May 2014 12:51:53 -0500
parents 786841fdb1e0
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* which.c - Find executable files in $PATH.
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2 *
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3 * Copyright 2006 Rob landley <rob@landley.net>
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4
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5a0faa267866 Fix which (the meaning of -a was reversed, and it was finding the _last_ hit).
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5 USE_WHICH(NEWTOY(which, "<1a", TOYFLAG_USR|TOYFLAG_BIN))
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7 config WHICH
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8 bool "which"
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9 default y
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10 help
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11 usage: which [-a] filename ...
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13 Search $PATH for executable files matching filename(s).
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15 -a Show all matches
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16 */
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17 #include "toys.h"
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19 // Find an exectuable file either at a path with a slash in it (absolute or
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20 // relative to current directory), or in $PATH. Returns absolute path to file,
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21 // or NULL if not found.
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23 static int which_in_path(char *filename)
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24 {
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25 struct string_list *list;
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27 // If they gave us a path, don't worry about $PATH or -a
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29 if (strchr(filename, '/')) {
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30 // Confirm it has the executable bit set, and it's not a directory.
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31 if (!access(filename, X_OK)) {
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32 struct stat st;
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34 if (!stat(filename, &st) && S_ISREG(st.st_mode)) {
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35 puts(filename);
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36 return 0;
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37 }
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38 return 1;
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39 }
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40 }
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42 // Search $PATH for matches.
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43 list = find_in_path(getenv("PATH"), filename);
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44 if (!list) return 1;
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46 // Print out matches
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47 while (list) {
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48 if (!access(list->str, X_OK)) {
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49 puts(list->str);
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50 // If we should stop at one match, do so
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51 if (!toys.optflags) {
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52 llist_traverse(list, free);
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53 break;
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54 }
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55 }
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56 free(llist_pop(&list));
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57 }
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59 return 0;
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60 }
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62 void which_main(void)
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63 {
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64 int i;
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66 for (i=0; toys.optargs[i]; i++)
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67 toys.exitval |= which_in_path(toys.optargs[i]);
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68 }