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1 | /*- |
2 | * Copyright (c) 1990 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * This code is derived from software contributed to Berkeley by | |
6 | * Cimarron D. Taylor of the University of California, Berkeley. | |
7 | * | |
8 | * %sccs.include.redist.c% | |
9 | */ | |
c08d5d47 | 10 | |
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11 | #ifndef lint |
12 | char copyright[] = | |
13 | "@(#) Copyright (c) 1990 The Regents of the University of California.\n\ | |
14 | All rights reserved.\n"; | |
15 | #endif /* not lint */ | |
b98da692 | 16 | |
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17 | #ifndef lint |
18 | static char sccsid[] = "@(#)find.c 4.25 (Berkeley) %G%"; | |
19 | #endif /* not lint */ | |
c08d5d47 | 20 | |
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21 | #include <sys/types.h> |
22 | #include <sys/stat.h> | |
23 | #include <fts.h> | |
24 | #include <stdio.h> | |
25 | #include <strings.h> | |
26 | #include <errno.h> | |
27 | #include "find.h" | |
28 | ||
29 | FTS *tree; /* pointer to top of FTS hierarchy */ | |
30 | time_t now; /* time find was run */ | |
31 | dev_t curdev = (dev_t)-1; /* device number of current tree */ | |
32 | int ftsoptions; /* options passed to ftsopen() */ | |
33 | int depth; /* set by -depth option */ | |
34 | int output_specified; /* one of -print, -ok or -exec was specified */ | |
35 | int xdev; /* set by -xdev option */ | |
46b257b1 | 36 | |
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37 | main(argc, argv) |
38 | int argc; | |
45fc66f9 | 39 | char **argv; |
c08d5d47 | 40 | { |
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41 | PLAN *plan; |
42 | char **paths, **find_getpaths(); | |
43 | PLAN *find_formplan(); | |
44 | time_t time(); | |
45 | ||
46 | (void)time(&now); /* initialize the time-of-day */ | |
c08d5d47 | 47 | |
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48 | if (argc < 2) |
49 | usage(); | |
50 | ||
51 | ftsoptions = FTS_MULTIPLE|FTS_NOSTAT|FTS_PHYSICAL; | |
c08d5d47 | 52 | |
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53 | paths = find_getpaths(&argv); /* places to start search */ |
54 | plan = find_formplan(argv); /* execution plan */ | |
55 | find_execute(plan, paths); | |
c08d5d47 | 56 | } |
c08d5d47 | 57 | |
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58 | /* |
59 | * find_formplan -- | |
60 | * process the command line and create a "plan" corresponding to the | |
61 | * command arguments. | |
62 | */ | |
63 | PLAN * | |
64 | find_formplan(argv) | |
65 | char **argv; | |
66 | { | |
67 | PLAN *plan, *tail, *new; | |
c08d5d47 | 68 | int i; |
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69 | PLAN *c_print(), *find_create(), *find_squish_not(), *find_squish_or(); |
70 | PLAN *find_squish_paren(); | |
71 | ||
72 | /* | |
73 | * for each argument in the command line, determine what kind of node | |
74 | * it is, create the appropriate node type and add the new plan node | |
75 | * to the end of the existing plan. The resulting plan is a linked | |
76 | * list of plan nodes. For example, the string: | |
77 | * | |
78 | * % find . -name foo -newer bar -print | |
79 | * | |
80 | * results in the plan: | |
81 | * | |
82 | * [-name foo]--> [-newer bar]--> [-print] | |
83 | * | |
84 | * in this diagram, `[-name foo]' represents the plan node generated | |
85 | * by c_name() with an argument of foo and `-->' represents the | |
86 | * plan->next pointer. | |
87 | */ | |
88 | for (plan = NULL; *argv;) { | |
89 | new = find_create(&argv); | |
90 | if (plan == NULL) | |
91 | tail = plan = new; | |
92 | else { | |
93 | tail->next = new; | |
94 | tail = new; | |
c08d5d47 | 95 | } |
c08d5d47 | 96 | } |
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97 | |
98 | /* | |
99 | * if the user didn't specify one of -print, -ok or -exec, then -print | |
100 | * is assumed so we add a -print node on the end. It is possible that | |
101 | * the user might want the -print someplace else on the command line, | |
102 | * but there's no way to know that. | |
103 | */ | |
104 | if (!output_specified) { | |
105 | new = c_print(); | |
106 | if (plan == NULL) | |
107 | tail = plan = new; | |
108 | else { | |
109 | tail->next = new; | |
110 | tail = new; | |
c08d5d47 | 111 | } |
c08d5d47 | 112 | } |
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113 | |
114 | /* | |
115 | * the command line has been completely processed into a search plan | |
116 | * except for the (, ), !, and -o operators. Rearrange the plan so | |
117 | * that the portions of the plan which are affected by the operators | |
118 | * are moved into operator nodes themselves. For example: | |
119 | * | |
120 | * [!]--> [-name foo]--> [-print] | |
121 | * | |
122 | * becomes | |
123 | * | |
124 | * [! [-name foo] ]--> [-print] | |
125 | * | |
126 | * and | |
127 | * | |
128 | * [(]--> [-depth]--> [-name foo]--> [)]--> [-print] | |
129 | * | |
130 | * becomes | |
131 | * | |
132 | * [expr [-depth]-->[-name foo] ]--> [-print] | |
133 | * | |
134 | * operators are handled in order of precedence. | |
135 | */ | |
136 | ||
137 | plan = find_squish_paren(plan); /* ()'s */ | |
138 | plan = find_squish_not(plan); /* !'s */ | |
139 | plan = find_squish_or(plan); /* -o's */ | |
140 | return(plan); | |
141 | } | |
142 | ||
143 | /* | |
144 | * find_execute -- | |
145 | * take a search plan and an array of search paths and executes the plan | |
146 | * over all FTSENT's returned for the given search paths. | |
147 | */ | |
148 | find_execute(plan, paths) | |
149 | PLAN *plan; /* search plan */ | |
150 | char **paths; /* array of pathnames to traverse */ | |
151 | { | |
152 | FTSENT *entry; /* current fts entry */ | |
153 | PLAN *p; | |
154 | ||
155 | if (!(tree = ftsopen(paths, ftsoptions, NULL))) { | |
156 | (void)fprintf(stderr, "find: ftsopen: %s.\n", strerror(errno)); | |
b98da692 | 157 | exit(1); |
365a571b | 158 | } |
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159 | while (entry = ftsread(tree)) { |
160 | switch(entry->info) { | |
161 | case FTS_DNR: | |
162 | (void)fprintf(stderr, | |
163 | "find: %s: unable to read.\n", entry->path); | |
365a571b | 164 | continue; |
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165 | case FTS_DNX: |
166 | (void)fprintf(stderr, | |
167 | "find: %s: unable to search.\n", entry->path); | |
168 | continue; | |
169 | case FTS_ERR: | |
170 | (void)fprintf(stderr, | |
171 | "find: %s: %s.\n", entry->path, strerror(errno)); | |
172 | continue; | |
173 | case FTS_D: | |
174 | if (depth) | |
b98da692 | 175 | continue; |
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176 | break; |
177 | case FTS_DC: | |
178 | (void)fprintf(stderr, | |
179 | "find: directory cycle: %s.\n", entry->path); | |
b98da692 | 180 | continue; |
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181 | case FTS_DP: |
182 | if (!depth) | |
183 | continue; | |
184 | case FTS_NS: | |
185 | if (!(ftsoptions & FTS_NOSTAT)) { | |
186 | (void)fprintf(stderr, | |
187 | "find: can't stat: %s.\n", entry->path); | |
188 | continue; | |
189 | } | |
190 | break; | |
b98da692 | 191 | } |
b98da692 | 192 | |
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193 | /* always keep curdev up to date, -fstype uses it. */ |
194 | if (xdev && curdev != entry->statb.st_dev && | |
195 | ftsset(tree, entry, FTS_SKIP)) { | |
196 | (void)fprintf(stderr, "find: %s: %s.\n", | |
197 | entry->path, strerror(errno)); | |
198 | exit(1); | |
b98da692 | 199 | } |
b98da692 | 200 | |
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201 | /* |
202 | * call all the functions in the execution plan until one is | |
203 | * false or all have been executed. This is where we do all | |
204 | * the work specified by the user on the command line. | |
205 | */ | |
206 | for (p = plan; p && (p->eval)(p, entry); p = p->next); | |
b98da692 | 207 | |
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208 | curdev = entry->statb.st_dev; |
209 | } | |
210 | (void)ftsclose(tree); | |
b98da692 | 211 | } |