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Diffstat (limited to 'contrib/patch/util.c')
| -rw-r--r-- | contrib/patch/util.c | 1070 |
1 files changed, 1070 insertions, 0 deletions
diff --git a/contrib/patch/util.c b/contrib/patch/util.c new file mode 100644 index 0000000..935b325 --- /dev/null +++ b/contrib/patch/util.c @@ -0,0 +1,1070 @@ +/* utility functions for `patch' */ + +/* $Id: util.c,v 1.22 1997/06/13 06:28:37 eggert Exp $ */ + +/* +Copyright 1986 Larry Wall +Copyright 1992, 1993, 1997 Free Software Foundation, Inc. + +This program is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program; see the file COPYING. +If not, write to the Free Software Foundation, +59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. +*/ + +#define XTERN extern +#include <common.h> +#include <backupfile.h> +#include <quotearg.h> +#include <version.h> +#undef XTERN +#define XTERN +#include <util.h> + +#include <maketime.h> +#include <partime.h> + +#include <signal.h> +#if !defined SIGCHLD && defined SIGCLD +#define SIGCHLD SIGCLD +#endif +#if ! HAVE_RAISE +# define raise(sig) kill (getpid (), sig) +#endif + +#ifdef __STDC__ +# include <stdarg.h> +# define vararg_start va_start +#else +# define vararg_start(ap,p) va_start (ap) +# if HAVE_VARARGS_H +# include <varargs.h> +# else + typedef char *va_list; +# define va_dcl int va_alist; +# define va_start(ap) ((ap) = (va_list) &va_alist) +# define va_arg(ap, t) (((t *) ((ap) += sizeof (t))) [-1]) +# define va_end(ap) +# endif +#endif + +static void makedirs PARAMS ((char *)); + +/* Move a file FROM to TO, renaming it if possible and copying it if necessary. + If we must create TO, use MODE to create it. + If FROM is null, remove TO (ignoring FROMSTAT). + Back up TO if BACKUP is nonzero. */ + +#ifdef __STDC__ +/* If mode_t doesn't promote to itself, we can't use old-style definition. */ +void +move_file (char const *from, char *to, mode_t mode, int backup) +#else +void +move_file (from, to, mode, backup) + char const *from; + char *to; + mode_t mode; + int backup; +#endif +{ + struct stat to_st; + int to_errno = ! backup ? -1 : stat (to, &to_st) == 0 ? 0 : errno; + + if (backup) + { + int try_makedirs_errno = 0; + char *bakname; + + if (origprae || origbase) + { + char const *p = origprae ? origprae : ""; + char const *b = origbase ? origbase : ""; + char const *o = base_name (to); + size_t plen = strlen (p); + size_t tlen = o - to; + size_t blen = strlen (b); + size_t osize = strlen (o) + 1; + bakname = xmalloc (plen + tlen + blen + osize); + memcpy (bakname, p, plen); + memcpy (bakname + plen, to, tlen); + memcpy (bakname + plen + tlen, b, blen); + memcpy (bakname + plen + tlen + blen, o, osize); + for (p += FILESYSTEM_PREFIX_LEN (p); *p; p++) + if (ISSLASH (*p)) + { + try_makedirs_errno = ENOENT; + break; + } + } + else + { + bakname = find_backup_file_name (to); + if (!bakname) + memory_fatal (); + } + + if (to_errno) + { + int fd; + if (debug & 4) + say ("creating empty unreadable file `%s'\n", bakname); + try_makedirs_errno = ENOENT; + unlink (bakname); + while ((fd = creat (bakname, 0)) < 0) + { + if (errno != try_makedirs_errno) + pfatal ("can't create file `%s'", bakname); + makedirs (bakname); + try_makedirs_errno = 0; + } + if (close (fd) != 0) + pfatal ("can't close `%s'", bakname); + } + else + { + if (debug & 4) + say ("renaming `%s' to `%s'\n", to, bakname); + while (rename (to, bakname) != 0) + { + if (errno != try_makedirs_errno) + pfatal ("can't rename `%s' to `%s'", to, bakname); + makedirs (bakname); + try_makedirs_errno = 0; + } + } + + free (bakname); + } + + if (from) + { + if (debug & 4) + say ("renaming `%s' to `%s'\n", from, to); + + if (rename (from, to) != 0) + { + if (errno == ENOENT + && (to_errno == -1 || to_errno == ENOENT)) + { + makedirs (to); + if (rename (from, to) == 0) + return; + } + +#ifdef EXDEV + if (errno == EXDEV) + { + if (! backup && unlink (to) != 0 && errno != ENOENT) + pfatal ("can't remove `%s'", to); + copy_file (from, to, mode); + return; + } +#endif + pfatal ("can't rename `%s' to `%s'", from, to); + } + } + else if (! backup) + { + if (debug & 4) + say ("removing `%s'\n", to); + if (unlink (to) != 0) + pfatal ("can't remove `%s'", to); + } +} + +/* Create FILE with OPEN_FLAGS, and with MODE adjusted so that + we can read and write the file and that the file is not executable. + Return the file descriptor. */ +#ifdef __STDC__ +/* If mode_t doesn't promote to itself, we can't use old-style definition. */ +int +create_file (char const *file, int open_flags, mode_t mode) +#else +int +create_file (file, open_flags, mode) + char const *file; + int open_flags; + mode_t mode; +#endif +{ + int fd; + mode |= S_IRUSR | S_IWUSR; + mode &= ~ (S_IXUSR | S_IXGRP | S_IXOTH); + if (! (O_CREAT && O_TRUNC)) + close (creat (file, mode)); + fd = open (file, O_CREAT | O_TRUNC | open_flags, mode); + if (fd < 0) + pfatal ("can't create `%s'", file); + return fd; +} + +/* Copy a file. */ + +#ifdef __STDC__ +/* If mode_t doesn't promote to itself, we can't use old-style definition. */ +void +copy_file (char const *from, char const *to, mode_t mode) +#else +void +copy_file (from, to, mode) + char const *from; + char const *to; + mode_t mode; +#endif +{ + int tofd; + int fromfd; + size_t i; + + if ((fromfd = open (from, O_RDONLY | O_BINARY)) < 0) + pfatal ("can't reopen `%s'", from); + tofd = create_file (to, O_WRONLY | O_BINARY, mode); + while ((i = read (fromfd, buf, bufsize)) != 0) + { + if (i == -1) + read_fatal (); + if (write (tofd, buf, i) != i) + write_fatal (); + } + if (close (fromfd) != 0) + read_fatal (); + if (close (tofd) != 0) + write_fatal (); +} + +static char const DEV_NULL[] = NULL_DEVICE; + +static char const SCCSPREFIX[] = "s."; +static char const GET[] = "get "; +static char const GET_LOCKED[] = "get -e "; +static char const SCCSDIFF1[] = "get -p "; +static char const SCCSDIFF2[] = "|diff - %s"; + +static char const RCSSUFFIX[] = ",v"; +static char const CHECKOUT[] = "co %s"; +static char const CHECKOUT_LOCKED[] = "co -l %s"; +static char const RCSDIFF1[] = "rcsdiff %s"; + +/* Return "RCS" if FILENAME is controlled by RCS, + "SCCS" if it is controlled by SCCS, and 0 otherwise. + READONLY is nonzero if we desire only readonly access to FILENAME. + FILESTAT describes FILENAME's status or is 0 if FILENAME does not exist. + If successful and if GETBUF is nonzero, set *GETBUF to a command + that gets the file; similarly for DIFFBUF and a command to diff the file. + *GETBUF and *DIFFBUF must be freed by the caller. */ +char const * +version_controller (filename, readonly, filestat, getbuf, diffbuf) + char const *filename; + int readonly; + struct stat const *filestat; + char **getbuf; + char **diffbuf; +{ + struct stat cstat; + char const *filebase = base_name (filename); + char const *dotslash = *filename == '-' ? "./" : ""; + size_t dir_len = filebase - filename; + size_t filenamelen = strlen (filename); + size_t maxfixlen = sizeof "SCCS/" - 1 + sizeof SCCSPREFIX - 1; + size_t maxtrysize = filenamelen + maxfixlen + 1; + size_t quotelen = quote_system_arg (0, filename); + size_t maxgetsize = sizeof GET_LOCKED + quotelen + maxfixlen; + size_t maxdiffsize = + (sizeof SCCSDIFF1 + sizeof SCCSDIFF2 + sizeof DEV_NULL - 1 + + 2 * quotelen + maxfixlen); + char *trybuf = xmalloc (maxtrysize); + char const *r = 0; + + strcpy (trybuf, filename); + +#define try1(f,a1) (sprintf (trybuf + dir_len, f, a1), stat (trybuf, &cstat) == 0) +#define try2(f,a1,a2) (sprintf (trybuf + dir_len, f, a1,a2), stat (trybuf, &cstat) == 0) + + /* Check that RCS file is not working file. + Some hosts don't report file name length errors. */ + + if ((try2 ("RCS/%s%s", filebase, RCSSUFFIX) + || try1 ("RCS/%s", filebase) + || try2 ("%s%s", filebase, RCSSUFFIX)) + && ! (filestat + && filestat->st_dev == cstat.st_dev + && filestat->st_ino == cstat.st_ino)) + { + if (getbuf) + { + char *p = *getbuf = xmalloc (maxgetsize); + sprintf (p, readonly ? CHECKOUT : CHECKOUT_LOCKED, dotslash); + p += strlen (p); + p += quote_system_arg (p, filename); + *p = '\0'; + } + + if (diffbuf) + { + char *p = *diffbuf = xmalloc (maxdiffsize); + sprintf (p, RCSDIFF1, dotslash); + p += strlen (p); + p += quote_system_arg (p, filename); + *p++ = '>'; + strcpy (p, DEV_NULL); + } + + r = "RCS"; + } + else if (try2 ("SCCS/%s%s", SCCSPREFIX, filebase) + || try2 ("%s%s", SCCSPREFIX, filebase)) + { + if (getbuf) + { + char *p = *getbuf = xmalloc (maxgetsize); + sprintf (p, readonly ? GET : GET_LOCKED); + p += strlen (p); + p += quote_system_arg (p, trybuf); + *p = '\0'; + } + + if (diffbuf) + { + char *p = *diffbuf = xmalloc (maxdiffsize); + strcpy (p, SCCSDIFF1); + p += sizeof SCCSDIFF1 - 1; + p += quote_system_arg (p, trybuf); + sprintf (p, SCCSDIFF2, dotslash); + p += strlen (p); + p += quote_system_arg (p, filename); + *p++ = '>'; + strcpy (p, DEV_NULL); + } + + r = "SCCS"; + } + + free (trybuf); + return r; +} + +/* Get FILENAME from version control system CS. The file already exists if + EXISTS is nonzero. Only readonly access is needed if READONLY is nonzero. + Use the command GETBUF to actually get the named file. + Store the resulting file status into *FILESTAT. + Return nonzero if successful. */ +int +version_get (filename, cs, exists, readonly, getbuf, filestat) + char const *filename; + char const *cs; + int exists; + int readonly; + char const *getbuf; + struct stat *filestat; +{ + if (patch_get < 0) + { + ask ("Get file `%s' from %s%s? [y] ", filename, + cs, readonly ? "" : " with lock"); + if (*buf == 'n') + return 0; + } + + if (dry_run) + { + if (! exists) + fatal ("can't do dry run on nonexistent version-controlled file `%s'; invoke `%s' and try again", + filename, getbuf); + } + else + { + if (verbosity == VERBOSE) + say ("Getting file `%s' from %s%s...\n", filename, + cs, readonly ? "" : " with lock"); + if (systemic (getbuf) != 0) + fatal ("can't get file `%s' from %s", filename, cs); + if (stat (filename, filestat) != 0) + pfatal ("%s", filename); + } + + return 1; +} + +/* Allocate a unique area for a string. */ + +char * +savebuf (s, size) + register char const *s; + register size_t size; +{ + register char *rv; + + assert (s && size); + rv = malloc (size); + + if (! rv) + { + if (! using_plan_a) + memory_fatal (); + } + else + memcpy (rv, s, size); + + return rv; +} + +char * +savestr(s) + char const *s; +{ + return savebuf (s, strlen (s) + 1); +} + +void +remove_prefix (p, prefixlen) + char *p; + size_t prefixlen; +{ + char const *s = p + prefixlen; + while ((*p++ = *s++)) + continue; +} + +#if !HAVE_VPRINTF +#define vfprintf my_vfprintf +static int vfprintf PARAMS ((FILE *, char const *, va_list)); +static int +vfprintf (stream, format, args) + FILE *stream; + char const *format; + va_list args; +{ +#if !HAVE_DOPRNT && HAVE__DOPRINTF +# define _doprnt _doprintf +#endif +#if HAVE_DOPRNT || HAVE__DOPRINTF + _doprnt (format, args, stream); + return ferror (stream) ? -1 : 0; +#else + int *a = (int *) args; + return fprintf (stream, format, + a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8], a[9]); +#endif +} +#endif /* !HAVE_VPRINTF */ + +/* Terminal output, pun intended. */ + +#ifdef __STDC__ +void +fatal (char const *format, ...) +#else +/*VARARGS1*/ void +fatal (format, va_alist) + char const *format; + va_dcl +#endif +{ + va_list args; + fprintf (stderr, "%s: **** ", program_name); + vararg_start (args, format); + vfprintf (stderr, format, args); + va_end (args); + putc ('\n', stderr); + fflush (stderr); + fatal_exit (0); +} + +void +memory_fatal () +{ + fatal ("out of memory"); +} + +void +read_fatal () +{ + pfatal ("read error"); +} + +void +write_fatal () +{ + pfatal ("write error"); +} + +/* Say something from patch, something from the system, then silence . . . */ + +#ifdef __STDC__ +void +pfatal (char const *format, ...) +#else +/*VARARGS1*/ void +pfatal (format, va_alist) + char const *format; + va_dcl +#endif +{ + int errnum = errno; + va_list args; + fprintf (stderr, "%s: **** ", program_name); + vararg_start (args, format); + vfprintf (stderr, format, args); + va_end (args); + fflush (stderr); /* perror bypasses stdio on some hosts. */ + errno = errnum; + perror (" "); + fflush (stderr); + fatal_exit (0); +} + +/* Tell the user something. */ + +#ifdef __STDC__ +void +say (char const *format, ...) +#else +/*VARARGS1*/ void +say (format, va_alist) + char const *format; + va_dcl +#endif +{ + va_list args; + vararg_start (args, format); + vfprintf (stdout, format, args); + va_end (args); + fflush (stdout); +} + +/* Get a response from the user, somehow or other. */ + +#ifdef __STDC__ +void +ask (char const *format, ...) +#else +/*VARARGS1*/ void +ask (format, va_alist) + char const *format; + va_dcl +#endif +{ + static int ttyfd = -2; + int r; + va_list args; + + vararg_start (args, format); + vfprintf (stdout, format, args); + va_end (args); + fflush (stdout); + + if (ttyfd == -2) + { + /* If standard output is not a tty, don't bother opening /dev/tty, + since it's unlikely that stdout will be seen by the tty user. + The isatty test also works around a bug in GNU Emacs 19.34 under Linux + which makes a call-process `patch' hang when it reads from /dev/tty. + POSIX.2 requires that we read /dev/tty, though. */ + ttyfd = (posixly_correct || isatty (STDOUT_FILENO) + ? open (TTY_DEVICE, O_RDONLY) + : -1); + } + + if (ttyfd < 0) + { + /* No terminal at all -- default it. */ + printf ("\n"); + buf[0] = '\n'; + buf[1] = '\0'; + } + else + { + size_t s = 0; + while ((r = read (ttyfd, buf + s, bufsize - 1 - s)) == bufsize - 1 - s + && buf[bufsize - 2] != '\n') + { + s = bufsize - 1; + bufsize *= 2; + buf = realloc (buf, bufsize); + if (!buf) + memory_fatal (); + } + if (r == 0) + printf ("EOF\n"); + else if (r < 0) + { + perror ("tty read"); + fflush (stderr); + close (ttyfd); + ttyfd = -1; + r = 0; + } + buf[s + r] = '\0'; + } +} + +/* Return nonzero if it OK to reverse a patch. */ + +#ifdef __STDC__ +int +ok_to_reverse (char const *format, ...) +#else +ok_to_reverse (format, va_alist) + char const *format; + va_dcl +#endif +{ + int r = 0; + + if (noreverse || ! (force && verbosity == SILENT)) + { + va_list args; + vararg_start (args, format); + vfprintf (stdout, format, args); + va_end (args); + } + + if (noreverse) + { + printf (" Skipping patch.\n"); + skip_rest_of_patch = TRUE; + r = 0; + } + else if (force) + { + if (verbosity != SILENT) + printf (" Applying it anyway.\n"); + r = 0; + } + else if (batch) + { + say (reverse ? " Ignoring -R.\n" : " Assuming -R.\n"); + r = 1; + } + else + { + ask (reverse ? " Ignore -R? [y] " : " Assume -R? [y] "); + r = *buf != 'n'; + if (! r) + { + ask ("Apply anyway? [n] "); + if (*buf != 'y') + { + if (verbosity != SILENT) + say ("Skipping patch.\n"); + skip_rest_of_patch = TRUE; + } + } + } + + return r; +} + +/* How to handle certain events when not in a critical region. */ + +#define NUM_SIGS (sizeof (sigs) / sizeof (*sigs)) +static int const sigs[] = { +#ifdef SIGHUP + SIGHUP, +#endif +#ifdef SIGPIPE + SIGPIPE, +#endif +#ifdef SIGTERM + SIGTERM, +#endif +#ifdef SIGXCPU + SIGXCPU, +#endif +#ifdef SIGXFSZ + SIGXFSZ, +#endif + SIGINT +}; + +#if !HAVE_SIGPROCMASK +#define sigset_t int +#define sigemptyset(s) (*(s) = 0) +#ifndef sigmask +#define sigmask(sig) (1 << ((sig) - 1)) +#endif +#define sigaddset(s, sig) (*(s) |= sigmask (sig)) +#define sigismember(s, sig) ((*(s) & sigmask (sig)) != 0) +#ifndef SIG_BLOCK +#define SIG_BLOCK 0 +#endif +#ifndef SIG_UNBLOCK +#define SIG_UNBLOCK (SIG_BLOCK + 1) +#endif +#ifndef SIG_SETMASK +#define SIG_SETMASK (SIG_BLOCK + 2) +#endif +#define sigprocmask(how, n, o) \ + ((how) == SIG_BLOCK \ + ? ((o) ? *(o) = sigblock (*(n)) : sigblock (*(n))) \ + : (how) == SIG_UNBLOCK \ + ? sigsetmask (((o) ? *(o) = sigblock (0) : sigblock (0)) & ~*(n)) \ + : (o ? *(o) = sigsetmask (*(n)) : sigsetmask (*(n)))) +#if !HAVE_SIGSETMASK +#define sigblock(mask) 0 +#define sigsetmask(mask) 0 +#endif +#endif + +static sigset_t initial_signal_mask; +static sigset_t signals_to_block; + +#if ! HAVE_SIGACTION +static RETSIGTYPE fatal_exit_handler PARAMS ((int)) __attribute__ ((noreturn)); +static RETSIGTYPE +fatal_exit_handler (sig) + int sig; +{ + signal (sig, SIG_IGN); + fatal_exit (sig); +} +#endif + +void +set_signals(reset) +int reset; +{ + int i; +#if HAVE_SIGACTION + struct sigaction initial_act, fatal_act; + fatal_act.sa_handler = fatal_exit; + sigemptyset (&fatal_act.sa_mask); + fatal_act.sa_flags = 0; +#define setup_handler(sig) sigaction (sig, &fatal_act, (struct sigaction *) 0) +#else +#define setup_handler(sig) signal (sig, fatal_exit_handler) +#endif + + if (!reset) + { +#ifdef SIGCHLD + /* System V fork+wait does not work if SIGCHLD is ignored. */ + signal (SIGCHLD, SIG_DFL); +#endif + sigemptyset (&signals_to_block); + for (i = 0; i < NUM_SIGS; i++) + { + int ignoring_signal; +#if HAVE_SIGACTION + if (sigaction (sigs[i], (struct sigaction *) 0, &initial_act) != 0) + continue; + ignoring_signal = initial_act.sa_handler == SIG_IGN; +#else + ignoring_signal = signal (sigs[i], SIG_IGN) == SIG_IGN; +#endif + if (! ignoring_signal) + { + sigaddset (&signals_to_block, sigs[i]); + setup_handler (sigs[i]); + } + } + } + else + { + /* Undo the effect of ignore_signals. */ +#if HAVE_SIGPROCMASK || HAVE_SIGSETMASK + sigprocmask (SIG_SETMASK, &initial_signal_mask, (sigset_t *) 0); +#else + for (i = 0; i < NUM_SIGS; i++) + if (sigismember (&signals_to_block, sigs[i])) + setup_handler (sigs[i]); +#endif + } +} + +/* How to handle certain events when in a critical region. */ + +void +ignore_signals() +{ +#if HAVE_SIGPROCMASK || HAVE_SIGSETMASK + sigprocmask (SIG_BLOCK, &signals_to_block, &initial_signal_mask); +#else + int i; + for (i = 0; i < NUM_SIGS; i++) + if (sigismember (&signals_to_block, sigs[i])) + signal (sigs[i], SIG_IGN); +#endif +} + +void +exit_with_signal (sig) + int sig; +{ + sigset_t s; + signal (sig, SIG_DFL); + sigemptyset (&s); + sigaddset (&s, sig); + sigprocmask (SIG_UNBLOCK, &s, (sigset_t *) 0); + raise (sig); + exit (2); +} + +int +systemic (command) + char const *command; +{ + if (debug & 8) + say ("+ %s\n", command); + fflush (stdout); + return system (command); +} + +#if !HAVE_MKDIR +/* These mkdir and rmdir substitutes are good enough for `patch'; + they are not general emulators. */ + +static int doprogram PARAMS ((char const *, char const *)); +static int mkdir PARAMS ((char const *, mode_t)); +static int rmdir PARAMS ((char const *)); + +static int +doprogram (program, arg) + char const *program; + char const *arg; +{ + int result; + static char const DISCARD_OUTPUT[] = " 2>/dev/null"; + size_t program_len = strlen (program); + char *cmd = xmalloc (program_len + 1 + quote_system_arg (0, arg) + + sizeof DISCARD_OUTPUT); + char *p = cmd; + strcpy (p, program); + p += program_len; + *p++ = ' '; + p += quote_system_arg (p, arg); + strcpy (p, DISCARD_OUTPUT); + result = systemic (cmd); + free (cmd); + return result; +} + +#ifdef __STDC__ +/* If mode_t doesn't promote to itself, we can't use old-style definition. */ +static int +mkdir (char const *path, mode_t mode) +#else +static int +mkdir (path, mode) + char const *path; + mode_t mode; /* ignored */ +#endif +{ + return doprogram ("mkdir", path); +} + +static int +rmdir (path) + char const *path; +{ + int result = doprogram ("rmdir", path); + errno = EEXIST; + return result; +} +#endif + +/* Replace '/' with '\0' in FILENAME if it marks a place that + needs testing for the existence of directory. Return the address + of the last location replaced, or 0 if none were replaced. */ +static char *replace_slashes PARAMS ((char *)); +static char * +replace_slashes (filename) + char *filename; +{ + char *f; + char *last_location_replaced = 0; + char const *component_start; + + for (f = filename + FILESYSTEM_PREFIX_LEN (filename); ISSLASH (*f); f++) + continue; + + component_start = f; + + for (; *f; f++) + if (ISSLASH (*f)) + { + char *slash = f; + + /* Treat multiple slashes as if they were one slash. */ + while (ISSLASH (f[1])) + f++; + + /* Ignore slashes at the end of the path. */ + if (! f[1]) + break; + + /* "." and ".." need not be tested. */ + if (! (slash - component_start <= 2 + && component_start[0] == '.' && slash[-1] == '.')) + { + *slash = '\0'; + last_location_replaced = slash; + } + + component_start = f + 1; + } + + return last_location_replaced; +} + +/* Make sure we'll have the directories to create a file. + Ignore the last element of `filename'. */ + +static void +makedirs (filename) + register char *filename; +{ + register char *f; + register char *flim = replace_slashes (filename); + + if (flim) + { + /* Create any missing directories, replacing NULs by '/'s. + Ignore errors. We may have to keep going even after an EEXIST, + since the path may contain ".."s; and when there is an EEXIST + failure the system may return some other error number. + Any problems will eventually be reported when we create the file. */ + for (f = filename; f <= flim; f++) + if (!*f) + { + mkdir (filename, + S_IRUSR|S_IWUSR|S_IXUSR + |S_IRGRP|S_IWGRP|S_IXGRP + |S_IROTH|S_IWOTH|S_IXOTH); + *f = '/'; + } + } +} + +/* Remove empty ancestor directories of FILENAME. + Ignore errors, since the path may contain ".."s, and when there + is an EEXIST failure the system may return some other error number. */ +void +removedirs (filename) + char *filename; +{ + size_t i; + + for (i = strlen (filename); i != 0; i--) + if (ISSLASH (filename[i]) + && ! (ISSLASH (filename[i - 1]) + || (filename[i - 1] == '.' + && (i == 1 + || ISSLASH (filename[i - 2]) + || (filename[i - 2] == '.' + && (i == 2 + || ISSLASH (filename[i - 3]))))))) + { + filename[i] = '\0'; + if (rmdir (filename) == 0 && verbosity == VERBOSE) + say ("Removed empty directory `%s'.\n", filename); + filename[i] = '/'; + } +} + +static time_t initial_time; + +void +init_time () +{ + time (&initial_time); +} + +/* Make filenames more reasonable. */ + +char * +fetchname (at, strip_leading, pstamp) +char *at; +int strip_leading; +time_t *pstamp; +{ + char *name; + register char *t; + int sleading = strip_leading; + time_t stamp = (time_t) -1; + + while (ISSPACE ((unsigned char) *at)) + at++; + if (debug & 128) + say ("fetchname %s %d\n", at, strip_leading); + + name = at; + /* Strip off up to `sleading' leading slashes and null terminate. */ + for (t = at; *t; t++) + { + if (ISSLASH (*t)) + { + while (ISSLASH (t[1])) + t++; + if (--sleading >= 0) + name = t+1; + } + else if (ISSPACE ((unsigned char) *t)) + { + if (set_time | set_utc) + stamp = str2time (t, initial_time, set_utc ? 0L : TM_LOCAL_ZONE); + else + { + /* The head says the file is nonexistent if the timestamp + is the epoch; but the listed time is local time, not UTC, + and POSIX.1 allows local time to be 24 hours away from UTC. + So match any time within 24 hours of the epoch. + Use a default time zone 24 hours behind UTC so that any + non-zoned time within 24 hours of the epoch is valid. */ + stamp = str2time (t, initial_time, -24L * 60 * 60); + if (0 <= stamp && stamp <= 2 * 24L * 60 * 60) + stamp = 0; + } + + *t = '\0'; + break; + } + } + + if (!*name) + return 0; + + /* Allow files to be created by diffing against /dev/null. */ + if (strcmp (at, "/dev/null") == 0) + { + if (pstamp) + *pstamp = 0; + return 0; + } + + if (pstamp) + *pstamp = stamp; + + return savestr (name); +} + +GENERIC_OBJECT * +xmalloc (size) + size_t size; +{ + register GENERIC_OBJECT *p = malloc (size); + if (!p) + memory_fatal (); + return p; +} + +void +Fseek (stream, offset, ptrname) + FILE *stream; + file_offset offset; + int ptrname; +{ + if (file_seek (stream, offset, ptrname) != 0) + pfatal ("fseek"); +} |
