1 /*- 2 * Copyright (c) 1992, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * Copyright (c) 1992, 1993, 1994, 1995, 1996 5 * Keith Bostic. All rights reserved. 6 * 7 * See the LICENSE file for redistribution information. 8 */ 9 10 #include "config.h" 11 12 #include <sys/queue.h> 13 #include <sys/time.h> 14 15 #include <bitstring.h> 16 #include <errno.h> 17 #include <limits.h> 18 #include <pwd.h> 19 #include <stdio.h> 20 #include <stdlib.h> 21 #include <string.h> 22 #include <unistd.h> 23 24 #include "../common/common.h" 25 26 /* 27 * ex_cd -- :cd[!] [directory] 28 * Change directories. 29 * 30 * PUBLIC: int ex_cd(SCR *, EXCMD *); 31 */ 32 int 33 ex_cd(SCR *sp, EXCMD *cmdp) 34 { 35 struct passwd *pw; 36 ARGS *ap; 37 int savech; 38 char *dir, *p, *t; 39 char *buf; 40 size_t dlen; 41 42 /* 43 * !!! 44 * Historic practice is that the cd isn't attempted if the file has 45 * been modified, unless its name begins with a leading '/' or the 46 * force flag is set. 47 */ 48 if (F_ISSET(sp->ep, F_MODIFIED) && 49 !FL_ISSET(cmdp->iflags, E_C_FORCE) && sp->frp->name[0] != '/') { 50 msgq(sp, M_ERR, 51 "120|File modified since last complete write; write or use ! to override"); 52 return (1); 53 } 54 55 switch (cmdp->argc) { 56 case 0: 57 /* If no argument, change to the user's home directory. */ 58 if ((dir = getenv("HOME")) == NULL) { 59 if ((pw = getpwuid(getuid())) == NULL || 60 pw->pw_dir == NULL || pw->pw_dir[0] == '\0') { 61 msgq(sp, M_ERR, 62 "121|Unable to find home directory location"); 63 return (1); 64 } 65 dir = pw->pw_dir; 66 } 67 break; 68 case 1: 69 INT2CHAR(sp, cmdp->argv[0]->bp, cmdp->argv[0]->len + 1, 70 dir, dlen); 71 break; 72 default: 73 abort(); 74 } 75 76 /* 77 * Try the current directory first. If this succeeds, don't display 78 * a message, vi didn't historically, and it should be obvious to the 79 * user where they are. 80 */ 81 if (!chdir(dir)) 82 return (0); 83 84 /* 85 * If moving to the user's home directory, or, the path begins with 86 * "/", "./" or "../", it's the only place we try. 87 */ 88 if (cmdp->argc == 0 || 89 (ap = cmdp->argv[0])->bp[0] == '/' || 90 (ap->len == 1 && ap->bp[0] == '.') || 91 (ap->len >= 2 && ap->bp[0] == '.' && ap->bp[1] == '.' && 92 (ap->bp[2] == '/' || ap->bp[2] == '\0'))) 93 goto err; 94 95 /* Try the O_CDPATH option values. */ 96 for (p = t = O_STR(sp, O_CDPATH);; ++p) 97 if (*p == '\0' || *p == ':') { 98 /* 99 * Ignore the empty strings and ".", since we've already 100 * tried the current directory. 101 */ 102 if (t < p && (p - t != 1 || *t != '.')) { 103 savech = *p; 104 *p = '\0'; 105 if ((buf = join(t, dir)) == NULL) { 106 msgq(sp, M_SYSERR, NULL); 107 return (1); 108 } 109 *p = savech; 110 if (!chdir(buf)) { 111 free(buf); 112 if ((buf = getcwd(NULL, 0)) != NULL) { 113 msgq_str(sp, M_INFO, buf, "122|New current directory: %s"); 114 free(buf); 115 } 116 return (0); 117 } 118 free(buf); 119 } 120 t = p + 1; 121 if (*p == '\0') 122 break; 123 } 124 125 err: msgq_str(sp, M_SYSERR, dir, "%s"); 126 return (1); 127 } 128