projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 8d4509b6 KB |
1 | /*- |
| 2 | * Copyright (c) 1991 The Regents of the University of California. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * %sccs.include.redist.c% | |
| 6 | */ | |
| 7 | ||
| 8 | #ifndef lint | |
| 9 | static char sccsid[] = "@(#)path.c 5.1 (Berkeley) %G%"; | |
| 10 | #endif /* not lint */ | |
| 11 | ||
| 12 | #include <sys/param.h> | |
| 13 | #include <stdio.h> | |
| 14 | #include <string.h> | |
| 15 | #include "cp.h" | |
| 16 | ||
| 17 | /* | |
| 18 | * These functions manipulate paths in PATH_T structures. | |
| 19 | * | |
| 20 | * They eliminate multiple slashes in paths when they notice them, | |
| 21 | * and keep the path non-slash terminated. | |
| 22 | * | |
| 23 | * Both path_set() and path_append() return 0 if the requested name | |
| 24 | * would be too long. | |
| 25 | */ | |
| 26 | ||
| 27 | #define STRIP_TRAILING_SLASH(p) { \ | |
| 28 | while ((p)->p_end > (p)->p_path && (p)->p_end[-1] == '/') \ | |
| 29 | *--(p)->p_end = 0; \ | |
| 30 | } | |
| 31 | ||
| 32 | /* | |
| 33 | * Move specified string into path. Convert "" to "." to handle BSD | |
| 34 | * semantics for a null path. Strip trailing slashes. | |
| 35 | */ | |
| 36 | path_set(p, string) | |
| 37 | register PATH_T *p; | |
| 38 | char *string; | |
| 39 | { | |
| 40 | if (strlen(string) > MAXPATHLEN) { | |
| 41 | (void)fprintf(stderr, | |
| 42 | "%s: %s: name too long.\n", progname, string); | |
| 43 | return(0); | |
| 44 | } | |
| 45 | ||
| 46 | (void)strcpy(p->p_path, string); | |
| 47 | p->p_end = p->p_path + strlen(p->p_path); | |
| 48 | ||
| 49 | if (p->p_path == p->p_end) { | |
| 50 | *p->p_end++ = '.'; | |
| 51 | *p->p_end = 0; | |
| 52 | } | |
| 53 | ||
| 54 | STRIP_TRAILING_SLASH(p); | |
| 55 | return(1); | |
| 56 | } | |
| 57 | ||
| 58 | /* | |
| 59 | * Append specified string to path, inserting '/' if necessary. Return a | |
| 60 | * pointer to the old end of path for restoration. | |
| 61 | */ | |
| 62 | char * | |
| 63 | path_append(p, name, len) | |
| 64 | register PATH_T *p; | |
| 65 | char *name; | |
| 66 | int len; | |
| 67 | { | |
| 68 | char *old; | |
| 69 | ||
| 70 | old = p->p_end; | |
| 71 | if (len == -1) | |
| 72 | len = strlen(name); | |
| 73 | ||
| 74 | /* The "+ 1" accounts for the '/' between old path and name. */ | |
| 75 | if ((len + p->p_end - p->p_path + 1) > MAXPATHLEN) { | |
| 76 | (void)fprintf(stderr, | |
| 77 | "%s: %s/%s: name too long.\n", progname, p->p_path, name); | |
| 78 | return(0); | |
| 79 | } | |
| 80 | ||
| 81 | /* | |
| 82 | * This code should always be executed, since paths shouldn't | |
| 83 | * end in '/'. | |
| 84 | */ | |
| 85 | if (p->p_end[-1] != '/') { | |
| 86 | *p->p_end++ = '/'; | |
| 87 | *p->p_end = 0; | |
| 88 | } | |
| 89 | ||
| 90 | (void)strncat(p->p_end, name, len); | |
| 91 | p->p_end += len; | |
| 92 | *p->p_end = 0; | |
| 93 | ||
| 94 | STRIP_TRAILING_SLASH(p); | |
| 95 | return(old); | |
| 96 | } | |
| 97 | ||
| 98 | /* | |
| 99 | * Restore path to previous value. (As returned by path_append.) | |
| 100 | */ | |
| 101 | void | |
| 102 | path_restore(p, old) | |
| 103 | PATH_T *p; | |
| 104 | char *old; | |
| 105 | { | |
| 106 | p->p_end = old; | |
| 107 | *p->p_end = 0; | |
| 108 | } | |
| 109 | ||
| 110 | /* | |
| 111 | * Return basename of path. | |
| 112 | */ | |
| 113 | char * | |
| 114 | path_basename(p) | |
| 115 | PATH_T *p; | |
| 116 | { | |
| 117 | char *basename; | |
| 118 | ||
| 119 | basename = rindex(p->p_path, '/'); | |
| 120 | return(basename ? basename + 1 : p->p_path); | |
| 121 | } |