/* * RCS utilities */ /* Copyright (C) 1982, 1988, 1989 Walter Tichy Copyright 1990, 1991 by Paul Eggert Distributed under license by the Free Software Foundation, Inc. This file is part of RCS. RCS 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. RCS 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 RCS; see the file COPYING. If not, write to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. Report problems and direct all questions to: rcs-bugs@cs.purdue.edu */ #include "rcsbase.h" libId(utilId, "$Id: rcsutil.c,v 1.3 1993/08/06 21:55:56 mycroft Exp $") #if !has_memcmp int memcmp(s1, s2, n) void const *s1, *s2; size_t n; { register unsigned char const *p1 = (unsigned char const*)s1, *p2 = (unsigned char const*)s2; register size_t i = n; register int r = 0; while (i-- && !(r = (*p1++ - *p2++))) ; return r; } #endif #if !has_memcpy void * memcpy(s1, s2, n) void *s1; void const *s2; size_t n; { register char *p1 = (char*)s1; register char const *p2 = (char const*)s2; while (n--) *p1++ = *p2++; return s1; } #endif #if lint malloc_type lintalloc; #endif /* * list of blocks allocated with ftestalloc() * These blocks can be freed by ffree when we're done with the current file. * We could put the free block inside struct alloclist, rather than a pointer * to the free block, but that would be less portable. */ struct alloclist { malloc_type alloc; struct alloclist *nextalloc; }; static struct alloclist *alloced; static malloc_type okalloc(p) malloc_type p; { if (!p) faterror("out of memory"); return p; } malloc_type testalloc(size) size_t size; /* Allocate a block, testing that the allocation succeeded. */ { return okalloc(malloc(size)); } malloc_type testrealloc(ptr, size) malloc_type ptr; size_t size; /* Reallocate a block, testing that the allocation succeeded. */ { return okalloc(realloc(ptr, size)); } malloc_type fremember(ptr) malloc_type ptr; /* Remember PTR in 'alloced' so that it can be freed later. Yield PTR. */ { register struct alloclist *q = talloc(struct alloclist); q->nextalloc = alloced; alloced = q; return q->alloc = ptr; } malloc_type ftestalloc(size) size_t size; /* Allocate a block, putting it in 'alloced' so it can be freed later. */ { return fremember(testalloc(size)); } void ffree() /* Free all blocks allocated with ftestalloc(). */ { register struct alloclist *p, *q; for (p = alloced; p; p = q) { q = p->nextalloc; tfree(p->alloc); tfree(p); } alloced = nil; } void ffree1(f) register char const *f; /* Free the block f, which was allocated by ftestalloc. */ { register struct alloclist *p, **a = &alloced; while ((p = *a)->alloc != f) a = &p->nextalloc; *a = p->nextalloc; tfree(p->alloc); tfree(p); } char * str_save(s) char const *s; /* Save s in permanently allocated storage. */ { return strcpy(tnalloc(char, strlen(s)+1), s); } char * fstr_save(s) char const *s; /* Save s in storage that will be deallocated when we're done with this file. */ { return strcpy(ftnalloc(char, strlen(s)+1), s); } char * cgetenv(name) char const *name; /* Like getenv(), but yield a copy; getenv() can overwrite old results. */ { register char *p; return (p=getenv(name)) ? str_save(p) : p; } char const * getusername(suspicious) int suspicious; /* Get the caller's login name. Trust only getwpuid if SUSPICIOUS. */ { static char *name; if (!name) { if ( /* Prefer getenv() unless suspicious; it's much faster. */ # if getlogin_is_secure (suspicious || !(name = cgetenv("LOGNAME")) && !(name = cgetenv("USER"))) && !(name = getlogin()) # else suspicious || !(name = cgetenv("LOGNAME")) && !(name = cgetenv("USER")) && !(name = getlogin()) # endif ) { #if has_getuid && has_getpwuid struct passwd const *pw = getpwuid(ruid()); if (!pw) faterror("no password entry for userid %lu", (unsigned long)ruid() ); name = pw->pw_name; #else #if has_setuid faterror("setuid not supported"); #else faterror("Who are you? Please set LOGNAME."); #endif #endif } checksid(name); } return name; } #if has_signal /* * Signal handling * * Standard C places too many restrictions on signal handlers. * We obey as many of them as we can. * Posix places fewer restrictions, and we are Posix-compatible here. */ static sig_atomic_t volatile heldsignal, holdlevel; static signal_type catchsig(s) int s; { char const *sname; char buf[BUFSIZ]; #if sig_zaps_handler /* If a signal arrives before we reset the signal handler, we lose. */ VOID signal(s, SIG_IGN); #endif if (holdlevel) { heldsignal = s; return; } ignoreints(); setrid(); if (!quietflag) { sname = nil; #if has_sys_siglist && defined(NSIG) if ((unsigned)s < NSIG) { # ifndef sys_siglist extern char *sys_siglist[]; # endif sname = sys_siglist[s]; } #else switch (s) { #ifdef SIGHUP case SIGHUP: sname = "Hangup"; break; #endif #ifdef SIGINT case SIGINT: sname = "Interrupt"; break; #endif #ifdef SIGPIPE case SIGPIPE: sname = "Broken pipe"; break; #endif #ifdef SIGQUIT case SIGQUIT: sname = "Quit"; break; #endif #ifdef SIGTERM case SIGTERM: sname = "Terminated"; break; #endif #ifdef SIGXCPU case SIGXCPU: sname = "Cputime limit exceeded"; break; #endif #ifdef SIGXFSZ case SIGXFSZ: sname = "Filesize limit exceeded"; break; #endif } #endif if (sname) VOID sprintf(buf, "\nRCS: %s. Cleaning up.\n", sname); else VOID sprintf(buf, "\nRCS: Signal %d. Cleaning up.\n", s); VOID write(STDERR_FILENO, buf, strlen(buf)); } exiterr(); } void ignoreints() { ++holdlevel; } void restoreints() { if (!--holdlevel && heldsignal) VOID catchsig(heldsignal); } static int const sig[] = { #ifdef SIGHUP SIGHUP, #endif #ifdef SIGINT SIGINT, #endif #ifdef SIGPIPE SIGPIPE, #endif #ifdef SIGQUIT SIGQUIT, #endif #ifdef SIGTERM SIGTERM, #endif #ifdef SIGXCPU SIGXCPU, #endif #ifdef SIGXFSZ SIGXFSZ, #endif }; #define SIGS (sizeof(sig)/sizeof(*sig)) #if has_sigaction static void check_sig(r) int r; { if (r != 0) efaterror("signal"); } static void setup_catchsig() { register int i; sigset_t blocked; struct sigaction act; check_sig(sigemptyset(&blocked)); for (i=SIGS; 0<=--i; ) check_sig(sigaddset(&blocked, sig[i])); for (i=SIGS; 0<=--i; ) { check_sig(sigaction(sig[i], (struct sigaction*)nil, &act)); if (act.sa_handler != SIG_IGN) { act.sa_handler = catchsig; act.sa_mask = blocked; check_sig(sigaction(sig[i], &act, (struct sigaction*)nil)); } } } #else #if has_sigblock static void setup_catchsig() { register int i; int mask; mask = 0; for (i=SIGS; 0<=--i; ) mask |= sigmask(sig[i]); mask = sigblock(mask); for (i=SIGS; 0<=--i; ) if ( signal(sig[i], catchsig) == SIG_IGN && signal(sig[i], SIG_IGN) != catchsig ) faterror("signal catcher failure"); VOID sigsetmask(mask); } #else static void setup_catchsig() { register i; for (i=SIGS; 0<=--i; ) if ( signal(sig[i], SIG_IGN) != SIG_IGN && signal(sig[i], catchsig) != SIG_IGN ) faterror("signal catcher failure"); } #endif #endif void catchints() { static int catching_ints; if (!catching_ints) { catching_ints = true; setup_catchsig(); } } #endif /* has_signal */ void fastcopy(inf,outf) register RILE *inf; FILE *outf; /* Function: copies the remainder of file inf to outf. */ { #if large_memory # if has_mmap awrite((char const*)inf->ptr, (size_t)(inf->lim - inf->ptr), outf); inf->ptr = inf->lim; # else for (;;) { awrite((char const*)inf->ptr, (size_t)(inf->readlim - inf->ptr), outf); inf->ptr = inf->readlim; if (inf->ptr == inf->lim) break; VOID Igetmore(inf); } # endif #else char buf[BUFSIZ*8]; register fread_type rcount; /*now read the rest of the file in blocks*/ while (!feof(inf)) { if (!(rcount = Fread(buf,sizeof(*buf),sizeof(buf),inf))) { testIerror(inf); return; } awrite(buf, (size_t)rcount, outf); } #endif } #ifndef SSIZE_MAX /* This does not work in #ifs, but it's good enough for us. */ /* Underestimating SSIZE_MAX may slow us down, but it won't break us. */ # define SSIZE_MAX ((unsigned)-1 >> 1) #endif void awrite(buf, chars, f) char const *buf; size_t chars; FILE *f; { /* Posix 1003.1-1990 ssize_t hack */ while (SSIZE_MAX < chars) { if (Fwrite(buf, sizeof(*buf), SSIZE_MAX, f) != SSIZE_MAX) Oerror(); buf += SSIZE_MAX; chars -= SSIZE_MAX; } if (Fwrite(buf, sizeof(*buf), chars, f) != chars) Oerror(); } static int movefd(old, new) int old, new; { if (old < 0 || old == new) return old; # ifdef F_DUPFD new = fcntl(old, F_DUPFD, new); # else new = dup2(old, new); # endif return close(old)==0 ? new : -1; } static int fdreopen(fd, file, flags) int fd; char const *file; int flags; { int newfd; VOID close(fd); newfd = #if !open_can_creat flags&O_CREAT ? creat(file, S_IRUSR|S_IWUSR) : #endif open(file, flags, S_IRUSR|S_IWUSR); return movefd(newfd, fd); } #if !has_spawn static void tryopen(fd,file,flags) int fd, flags; char const *file; { if (file && fdreopen(fd,file,flags) != fd) efaterror(file); } #else static int tryopen(fd,file,flags) int fd, flags; char const *file; { int newfd = -1; if (file && ((newfd=dup(fd)) < 0 || fdreopen(fd,file,flags) != fd)) efaterror(file); return newfd; } static void redirect(old, new) int old, new; { if (0 <= old && (close(new) != 0 || movefd(old,new) < 0)) efaterror("spawn I/O redirection"); } #endif #if !has_fork && !has_spawn static void bufargcat(b, c, s) register struct buf *b; int c; register char const *s; /* Append to B a copy of C, plus a quoted copy of S. */ { register char *p; register char const *t; size_t bl, sl; for (t=s, sl=0; *t; ) sl += 3*(*t++=='\'') + 1; bl = strlen(b->string); bufrealloc(b, bl + sl + 4); p = b->string + bl; *p++ = c; *p++ = '\''; while (*s) { if (*s == '\'') { *p++ = '\''; *p++ = '\\'; *p++ = '\''; } *p++ = *s++; } *p++ = '\''; *p = 0; } #endif /* * Run a command specified by the strings in 'inoutargs'. * inoutargs[0], if nonnil, is the name of the input file. * inoutargs[1], if nonnil, is the name of the output file. * inoutargs[2..] form the command to be run. */ int runv(inoutargs) char const **inoutargs; { register char const **p; int wstatus; oflush(); eflush(); { #if has_spawn int in, out; p = inoutargs; in = tryopen(STDIN_FILENO, *p++, O_BINARY|O_RDONLY); out = tryopen(STDOUT_FILENO, *p++, O_BINARY|O_CREAT|O_TRUNC|O_WRONLY); wstatus = spawn_RCS(0, *p, (char*const*)p); if (wstatus == -1 && errno == ENOEXEC) { *--p = RCS_SHELL; wstatus = spawnv(0, *p, (char*const*)p); } redirect(in, STDIN_FILENO); redirect(out, STDOUT_FILENO); #else #if has_fork pid_t pid; # if !has_waitpid pid_t w; # endif if (!(pid = vfork())) { p = inoutargs; tryopen(STDIN_FILENO, *p++, O_BINARY|O_RDONLY); tryopen(STDOUT_FILENO, *p++, O_BINARY|O_CREAT|O_TRUNC|O_WRONLY); VOID exec_RCS(*p, (char*const*)p); if (errno == ENOEXEC) { *--p = RCS_SHELL; VOID execv(*p, (char*const*)p); } VOID write(STDERR_FILENO, *p, strlen(*p)); VOID write(STDERR_FILENO, ": not found\n", 12); _exit(EXIT_TROUBLE); } if (pid < 0) efaterror("fork"); # if has_waitpid if (waitpid(pid, &wstatus, 0) < 0) efaterror("waitpid"); # else do { if ((w = wait(&wstatus)) < 0) efaterror("wait"); } while (w != pid); # endif #else static struct buf b; /* Use system(). On many hosts system() discards signals. Yuck! */ p = inoutargs+2; bufscpy(&b, *p); while (*++p) bufargcat(&b, ' ', *p); if (inoutargs[0]) bufargcat(&b, '<', inoutargs[0]); if (inoutargs[1]) bufargcat(&b, '>', inoutargs[1]); wstatus = system(b.string); #endif #endif } if (!WIFEXITED(wstatus)) faterror("%s failed", inoutargs[2]); return WEXITSTATUS(wstatus); } #define CARGSMAX 20 /* * Run a command. * The first two arguments are the input and output files (if nonnil); * the rest specify the command and its arguments. */ int #if has_prototypes run(char const *infile, char const *outfile, ...) #else /*VARARGS2*/ run(infile, outfile, va_alist) char const *infile; char const *outfile; va_dcl #endif { va_list ap; char const *rgargs[CARGSMAX]; register i = 0; rgargs[0] = infile; rgargs[1] = outfile; vararg_start(ap, outfile); for (i = 2; (rgargs[i++] = va_arg(ap, char const*)); ) if (CARGSMAX <= i) faterror("too many command arguments"); va_end(ap); return runv(rgargs); } char const * date2str(date, datebuf) char const date[datesize]; char datebuf[datesize]; /* * Format a user-readable form of the RCS format DATE into the buffer DATEBUF. * Yield DATEBUF. */ { register char const *p = date; while (*p++ != '.') ; VOID sprintf(datebuf, "19%.*s/%.2s/%.2s %.2s:%.2s:%s" + (date[2]=='.' && VERSION(5)<=RCSversion ? 0 : 2), (int)(p-date-1), date, p, p+3, p+6, p+9, p+12 ); return datebuf; } int RCSversion; void setRCSversion(str) char const *str; { static int oldversion; register char const *s = str + 2; int v = VERSION_DEFAULT; if (oldversion) redefined('V'); oldversion = true; if (*s) { v = 0; while (isdigit(*s)) v = 10*v + *s++ - '0'; if (*s) faterror("%s isn't a number", str); if (v < VERSION_min || VERSION_max < v) faterror("%s out of range %d..%d", str, VERSION_min, VERSION_max); } RCSversion = VERSION(v); } int getRCSINIT(argc, argv, newargv) int argc; char **argv, ***newargv; { register char *p, *q, **pp; unsigned n; if (!(q = cgetenv("RCSINIT"))) *newargv = argv; else { n = argc + 2; /* * Count spaces in RCSINIT to allocate a new arg vector. * This is an upper bound, but it's OK even if too large. */ for (p = q; ; ) { switch (*p++) { default: continue; case ' ': case '\b': case '\f': case '\n': case '\r': case '\t': case '\v': n++; continue; case '\0': break; } break; } *newargv = pp = tnalloc(char*, n); *pp++ = *argv++; /* copy program name */ for (p = q; ; ) { for (;;) { switch (*q) { case '\0': goto copyrest; case ' ': case '\b': case '\f': case '\n': case '\r': case '\t': case '\v': q++; continue; } break; } *pp++ = p; ++argc; for (;;) { switch ((*p++ = *q++)) { case '\0': goto copyrest; case '\\': if (!*q) goto copyrest; p[-1] = *q++; continue; default: continue; case ' ': case '\b': case '\f': case '\n': case '\r': case '\t': case '\v': break; } break; } p[-1] = '\0'; } copyrest: while ((*pp++ = *argv++)) ; } return argc; } #define cacheid(E) static uid_t i; static int s; if (!s){ s=1; i=(E); } return i #if has_getuid uid_t ruid() { cacheid(getuid()); } #endif #if has_setuid uid_t euid() { cacheid(geteuid()); } #endif #if has_setuid /* * Setuid execution really works only with Posix 1003.1a Draft 5 seteuid(), * because it lets us switch back and forth between arbitrary users. * If seteuid() doesn't work, we fall back on setuid(), * which works if saved setuid is supported, * unless the real or effective user is root. * This area is such a mess that we always check switches at runtime. */ static void set_uid_to(u) uid_t u; /* Become user u. */ { static int looping; if (euid() == ruid()) return; #if (has_fork||has_spawn) && DIFF_ABSOLUTE if (seteuid(u) != 0) efaterror("setuid"); #endif if (geteuid() != u) { if (looping) return; looping = true; faterror("root setuid not supported" + (u?5:0)); } } static int stick_with_euid; void /* Ignore all calls to seteid() and setrid(). */ nosetid() { stick_with_euid = true; } void seteid() /* Become effective user. */ { if (!stick_with_euid) set_uid_to(euid()); } void setrid() /* Become real user. */ { if (!stick_with_euid) set_uid_to(ruid()); } #endif