Commit | Line | Data |
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41c680d7 BJ |
1 | /* Copyright (c) 1979 Regents of the University of California */ |
2 | #include "sh.h" | |
3 | ||
4 | /* | |
5 | * C shell | |
6 | */ | |
7 | ||
8 | /* | |
9 | * System level search and execute of a command. | |
10 | * We look in each directory for the specified command name. | |
11 | * If the name contains a '/' then we execute only the full path name. | |
12 | * If there is no search path then we execute only full path names. | |
13 | */ | |
14 | ||
15 | /* | |
16 | * As we search for the command we note the first non-trivial error | |
17 | * message for presentation to the user. This allows us often | |
18 | * to show that a file has the wrong mode/no access when the file | |
19 | * is not in the last component of the search path, so we must | |
20 | * go on after first detecting the error. | |
21 | */ | |
22 | char *exerr; /* Execution error message */ | |
23 | char *expath; /* Path for exerr */ | |
24 | ||
25 | /* Dummy search path for just absolute search when no path */ | |
26 | char *justabs[] = { "", 0 }; | |
27 | ||
28 | doexec(t) | |
29 | register struct command *t; | |
30 | { | |
31 | char *sav; | |
32 | register char *dp, **pv, **av; | |
33 | register struct varent *v; | |
34 | bool slash = any('/', t->t_dcom[0]); | |
35 | char *blk[2]; | |
36 | ||
37 | /* | |
38 | * Glob the command name. If this does anything, then we | |
39 | * will execute the command only relative to ".". One special | |
40 | * case: if there is no PATH, then we execute only commands | |
41 | * which start with '/'. | |
42 | */ | |
43 | dp = globone(t->t_dcom[0]); | |
44 | xfree(t->t_dcom[0]); | |
45 | exerr = 0; expath = t->t_dcom[0] = dp; | |
46 | v = adrof("path"); | |
47 | if (v == 0 && expath[0] != '/') | |
48 | pexerr(); | |
49 | slash |= gflag; | |
50 | ||
51 | /* | |
52 | * Glob the argument list, if necessary. | |
53 | * Otherwise trim off the quote bits. | |
54 | */ | |
55 | gflag = 0; av = &t->t_dcom[1]; | |
56 | rscan(av, tglob); | |
57 | if (gflag) { | |
58 | av = glob(av); | |
59 | if (av == 0) | |
60 | error("No match"); | |
61 | } | |
62 | blk[0] = t->t_dcom[0]; | |
63 | blk[1] = 0; | |
64 | av = blkspl(blk, av); | |
65 | scan(av, trim); | |
66 | ||
67 | xechoit(av); /* Echo command if -x */ | |
68 | closech(); /* Close random fd's */ | |
69 | ||
70 | /* | |
71 | * If no path, no words in path, or a / in the filename | |
72 | * then restrict the command search. | |
73 | */ | |
74 | if (v == 0 || v->vec[0] == 0 || slash) | |
75 | pv = justabs; | |
76 | else | |
77 | pv = v->vec; | |
78 | sav = strspl("/", *av); /* / command name for postpending */ | |
79 | do { | |
80 | if (pv[0][0] == 0 || eq(pv[0], ".")) /* don't make ./xxx */ | |
81 | texec(*av, av); | |
82 | else { | |
83 | dp = strspl(*pv, sav); | |
84 | texec(dp, av); | |
85 | xfree(dp); | |
86 | } | |
87 | pv++; | |
88 | } while (*pv); | |
89 | xfree(sav); | |
90 | xfree(av); | |
91 | pexerr(); | |
92 | } | |
93 | ||
94 | pexerr() | |
95 | { | |
96 | ||
97 | /* Couldn't find the damn thing */ | |
98 | setname(expath); | |
99 | xfree(expath); | |
100 | if (exerr) | |
101 | bferr(exerr); | |
102 | bferr("Command not found"); | |
103 | } | |
104 | ||
105 | /* Last resort shell */ | |
106 | char *lastsh[] = { SHELLPATH, 0 }; | |
107 | ||
108 | /* | |
109 | * Execute command f, arg list t. | |
110 | * Record error message if not found. | |
111 | * Also do shell scripts here. | |
112 | */ | |
113 | texec(f, t) | |
114 | char *f; | |
115 | register char **t; | |
116 | { | |
117 | register struct varent *v; | |
118 | register char **vp; | |
119 | extern char *sys_errlist[]; | |
120 | ||
121 | execv(f, t); | |
122 | switch (errno) { | |
123 | ||
124 | case ENOEXEC: | |
125 | /* | |
126 | * If there is an alias for shell, then | |
127 | * put the words of the alias in front of the | |
128 | * argument list replacing the command name. | |
129 | * Note no interpretation of the words at this point. | |
130 | */ | |
131 | v = adrof1("shell", &aliases); | |
132 | if (v == 0) { | |
133 | #ifdef OTHERSH | |
134 | register int ff = open(f, 0); | |
135 | char ch; | |
136 | #endif | |
137 | ||
138 | vp = lastsh; | |
139 | vp[0] = adrof("shell") ? value("shell") : SHELLPATH; | |
140 | #ifdef OTHERSH | |
141 | if (ff != -1 && read(ff, &ch, 1) == 1 && ch != '#') | |
142 | vp[0] = OTHERSH; | |
143 | close(ff); | |
144 | #endif | |
145 | } else | |
146 | vp = v->vec; | |
147 | t[0] = f; | |
148 | t = blkspl(vp, t); /* Splice up the new arglst */ | |
149 | f = *t; | |
150 | execv(f, t); | |
151 | xfree(t); | |
152 | /* The sky is falling, the sky is falling! */ | |
153 | ||
154 | case ENOMEM: | |
155 | Perror(f); | |
156 | ||
157 | case ENOENT: | |
158 | break; | |
159 | ||
160 | default: | |
161 | if (exerr == 0) { | |
162 | exerr = sys_errlist[errno]; | |
163 | expath = savestr(f); | |
164 | } | |
165 | } | |
166 | } | |
167 | ||
168 | execash(t, kp) | |
169 | register struct command *kp; | |
170 | { | |
171 | ||
172 | didcch++; | |
173 | lshift(kp->t_dcom, 1); | |
174 | doexec(kp); | |
175 | /*NOTREACHED*/ | |
176 | } | |
177 | ||
178 | xechoit(t) | |
179 | char **t; | |
180 | { | |
181 | ||
182 | if (adrof("echo")) { | |
183 | flush(); | |
184 | haderr = 1; | |
185 | blkpr(t), printf("\n"); | |
186 | haderr = 0; | |
187 | } | |
188 | } |