Annotation of src/usr.bin/patch/backupfile.c, Revision 1.11
1.11 ! deraadt 1: /* $OpenBSD: backupfile.c,v 1.10 2003/07/18 02:00:09 deraadt Exp $ */
1.2 niklas 2:
1.11 ! deraadt 3: /*
! 4: * backupfile.c -- make Emacs style backup file names Copyright (C) 1990 Free
! 5: * Software Foundation, Inc.
! 6: *
! 7: * This program is free software; you can redistribute it and/or modify it
! 8: * without restriction.
! 9: *
! 10: * This program is distributed in the hope that it will be useful, but WITHOUT
! 11: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
! 12: * FITNESS FOR A PARTICULAR PURPOSE.
! 13: */
! 14:
! 15: /*
! 16: * David MacKenzie <djm@ai.mit.edu>. Some algorithms adapted from GNU Emacs.
! 17: */
1.1 deraadt 18:
19: #ifndef lint
1.11 ! deraadt 20: static char rcsid[] = "$OpenBSD: backupfile.c,v 1.10 2003/07/18 02:00:09 deraadt Exp $";
! 21: #endif /* not lint */
1.1 deraadt 22:
23: #include <stdio.h>
24: #include <stdlib.h>
25: #include <string.h>
26: #include <ctype.h>
1.6 millert 27: #include <libgen.h>
1.1 deraadt 28: #include <sys/types.h>
29: #include "backupfile.h"
30: #include "config.h"
31:
32: #ifdef DIRENT
33: #include <dirent.h>
34: #ifdef direct
35: #undef direct
36: #endif
37: #define direct dirent
38: #define NLENGTH(direct) (strlen((direct)->d_name))
1.11 ! deraadt 39: #else /* !DIRENT */
1.1 deraadt 40: #define NLENGTH(direct) ((direct)->d_namlen)
1.11 ! deraadt 41: #endif /* !DIRENT */
1.1 deraadt 42:
43: #define ISDIGIT(c) (isascii (c) && isdigit (c))
44:
45: #include <unistd.h>
46:
47: #if defined (_POSIX_VERSION)
1.11 ! deraadt 48: /*
! 49: * POSIX does not require that the d_ino field be present, and some systems
! 50: * do not provide it.
! 51: */
1.1 deraadt 52: #define REAL_DIR_ENTRY(dp) 1
53: #else
54: #define REAL_DIR_ENTRY(dp) ((dp)->d_ino != 0)
55: #endif
56:
57: /* Which type of backup file names are generated. */
58: enum backup_type backup_type = none;
59:
1.11 ! deraadt 60: /*
! 61: * The extension added to file names to produce a simple (as opposed to
! 62: * numbered) backup file name.
! 63: */
! 64: char *simple_backup_suffix = "~";
! 65:
! 66: static char *concat(char *, char *);
! 67: char *find_backup_file_name(char *);
! 68: static char *make_version_name(char *, int);
! 69: static int max_backup_version(char *, char *);
! 70: static int version_number(char *, char *, int);
! 71: static int argmatch(char *, char **);
! 72: static void invalid_arg(char *, char *, int);
! 73:
! 74: /*
! 75: * Return the name of the new backup file for file FILE, allocated with
! 76: * malloc. Return 0 if out of memory. FILE must not end with a '/' unless it
! 77: * is the root directory. Do not call this function if backup_type == none.
! 78: */
1.1 deraadt 79: char *
1.11 ! deraadt 80: find_backup_file_name(char *file)
1.1 deraadt 81: {
1.11 ! deraadt 82: char *dir, *base_versions;
! 83: int highest_backup;
! 84:
! 85: if (backup_type == simple)
! 86: return concat(file, simple_backup_suffix);
! 87: base_versions = concat(basename(file), ".~");
! 88: if (base_versions == 0)
! 89: return 0;
! 90: dir = dirname(file);
! 91: if (dir == 0) {
! 92: free(base_versions);
! 93: return 0;
! 94: }
! 95: highest_backup = max_backup_version(base_versions, dir);
! 96: free(base_versions);
! 97: if (backup_type == numbered_existing && highest_backup == 0)
! 98: return concat(file, simple_backup_suffix);
! 99: return make_version_name(file, highest_backup + 1);
1.1 deraadt 100: }
101:
1.11 ! deraadt 102: /*
! 103: * Return the number of the highest-numbered backup file for file FILE in
! 104: * directory DIR. If there are no numbered backups of FILE in DIR, or an
! 105: * error occurs reading DIR, return 0. FILE should already have ".~" appended
! 106: * to it.
! 107: */
1.1 deraadt 108: static int
1.11 ! deraadt 109: max_backup_version(char *file, char *dir)
1.1 deraadt 110: {
1.11 ! deraadt 111: DIR *dirp;
! 112: struct direct *dp;
! 113: int highest_version, this_version, file_name_length;
! 114:
! 115: dirp = opendir(dir);
! 116: if (!dirp)
! 117: return 0;
! 118:
! 119: highest_version = 0;
! 120: file_name_length = strlen(file);
! 121:
! 122: while ((dp = readdir(dirp)) != 0) {
! 123: if (!REAL_DIR_ENTRY(dp) || NLENGTH(dp) <= file_name_length)
! 124: continue;
! 125:
! 126: this_version = version_number(file, dp->d_name, file_name_length);
! 127: if (this_version > highest_version)
! 128: highest_version = this_version;
! 129: }
! 130: closedir(dirp);
! 131: return highest_version;
1.1 deraadt 132: }
133:
1.11 ! deraadt 134: /*
! 135: * Return a string, allocated with malloc, containing "FILE.~VERSION~".
! 136: * Return 0 if out of memory.
! 137: */
1.1 deraadt 138: static char *
1.11 ! deraadt 139: make_version_name(char *file, int version)
1.1 deraadt 140: {
1.11 ! deraadt 141: char *backup_name;
1.1 deraadt 142:
1.11 ! deraadt 143: if (asprintf(&backup_name, "%s.~%d~", file, version) == -1)
! 144: return 0;
! 145: return backup_name;
1.1 deraadt 146: }
147:
1.11 ! deraadt 148: /*
! 149: * If BACKUP is a numbered backup of BASE, return its version number;
! 150: * otherwise return 0. BASE_LENGTH is the length of BASE. BASE should
! 151: * already have ".~" appended to it.
! 152: */
1.1 deraadt 153: static int
1.11 ! deraadt 154: version_number(char *base, char *backup, int base_length)
1.1 deraadt 155: {
1.11 ! deraadt 156: int version;
! 157: char *p;
1.10 deraadt 158:
1.1 deraadt 159: version = 0;
1.11 ! deraadt 160: if (!strncmp(base, backup, base_length) && ISDIGIT(backup[base_length])) {
! 161: for (p = &backup[base_length]; ISDIGIT(*p); ++p)
! 162: version = version * 10 + *p - '0';
! 163: if (p[0] != '~' || p[1])
! 164: version = 0;
! 165: }
! 166: return version;
1.1 deraadt 167: }
168:
1.11 ! deraadt 169: /*
! 170: * Return the newly-allocated concatenation of STR1 and STR2. If out of
! 171: * memory, return 0.
! 172: */
! 173: static char *
! 174: concat(char *str1, char *str2)
1.1 deraadt 175: {
1.11 ! deraadt 176: char *newstr;
1.1 deraadt 177:
1.11 ! deraadt 178: if (asprintf(&newstr, "%s%s", str1, str2) == -1)
! 179: return 0;
! 180: return newstr;
1.1 deraadt 181: }
182:
1.11 ! deraadt 183: /*
! 184: * If ARG is an unambiguous match for an element of the null-terminated array
! 185: * OPTLIST, return the index in OPTLIST of the matched element, else -1 if it
! 186: * does not match any element or -2 if it is ambiguous (is a prefix of more
! 187: * than one element).
! 188: */
1.1 deraadt 189: int
1.11 ! deraadt 190: argmatch(char *arg, char **optlist)
1.1 deraadt 191: {
1.11 ! deraadt 192: int i; /* Temporary index in OPTLIST. */
! 193: int arglen; /* Length of ARG. */
! 194: int matchind = -1; /* Index of first nonexact match. */
! 195: int ambiguous = 0; /* If nonzero, multiple nonexact match(es). */
! 196:
! 197: arglen = strlen(arg);
! 198:
! 199: /* Test all elements for either exact match or abbreviated matches. */
! 200: for (i = 0; optlist[i]; i++) {
! 201: if (!strncmp(optlist[i], arg, arglen)) {
! 202: if (strlen(optlist[i]) == arglen)
! 203: /* Exact match found. */
! 204: return i;
! 205: else if (matchind == -1)
! 206: /* First nonexact match found. */
! 207: matchind = i;
! 208: else
! 209: /* Second nonexact match found. */
! 210: ambiguous = 1;
! 211: }
1.1 deraadt 212: }
1.11 ! deraadt 213: if (ambiguous)
! 214: return -2;
! 215: else
! 216: return matchind;
1.1 deraadt 217: }
218:
1.11 ! deraadt 219: /*
! 220: * Error reporting for argmatch. KIND is a description of the type of entity
! 221: * that was being matched. VALUE is the invalid value that was given. PROBLEM
! 222: * is the return value from argmatch.
! 223: */
1.1 deraadt 224: void
1.11 ! deraadt 225: invalid_arg(char *kind, char *value, int problem)
1.1 deraadt 226: {
1.11 ! deraadt 227: fprintf(stderr, "patch: ");
! 228: if (problem == -1)
! 229: fprintf(stderr, "invalid");
! 230: else /* Assume -2. */
! 231: fprintf(stderr, "ambiguous");
! 232: fprintf(stderr, " %s `%s'\n", kind, value);
1.1 deraadt 233: }
234:
1.11 ! deraadt 235: static char *backup_args[] = {
! 236: "never", "simple", "nil", "existing", "t", "numbered", 0
1.1 deraadt 237: };
238:
1.11 ! deraadt 239: static enum backup_type backup_types[] = {
! 240: simple, simple, numbered_existing,
! 241: numbered_existing, numbered, numbered
1.1 deraadt 242: };
243:
1.11 ! deraadt 244: /*
! 245: * Return the type of backup indicated by VERSION. Unique abbreviations are
! 246: * accepted.
! 247: */
1.1 deraadt 248: enum backup_type
1.11 ! deraadt 249: get_version(char *version)
1.1 deraadt 250: {
1.11 ! deraadt 251: int i;
1.1 deraadt 252:
1.11 ! deraadt 253: if (version == 0 || *version == 0)
! 254: return numbered_existing;
! 255: i = argmatch(version, backup_args);
! 256: if (i >= 0)
! 257: return backup_types[i];
! 258: invalid_arg("version control type", version, i);
! 259: exit(1);
1.1 deraadt 260: }
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