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- /* $Header: pch.c,v 2.0.1 90/05/30 11:30:00 mward $
- *
- * $Log: pch.c,v $
- * Revision 2.0.1 90/05/30 11:30:00 mward
- * modify calls to read, write to detect error on return of value -1
- * added TURBOC20 ifdef stuff:
- * no inodes: modify move_file same file detect accordingly
- * no links: modify move_file link calls to copy_file calls
- * no SIGHUP: modify signal routines accordingly
- *
- */
-
- #include "EXTERN.h"
- #include "common.h"
- #include "INTERN.h"
- #include "util.h"
-
- #ifdef TURBOC20
- #include <dir.h>
- /* fnappend : Append first char of bext to a MSDOS file name.
- * bext should not start with a letter or digit.
- */
-
- void
- fnappend(fspec,bext)
- char *fspec, *bext;
- {
- char *fnmex;
- char fname[MAXFILE];
- char fext[MAXEXT];
- int i,j;
- int fnlen;
- int felen;
-
- /* fnmex should point to first char of file name/extension
- * (not path or drive)
- */
- fnmex = fspec + strlen(fspec);
- while ((fnmex!=fspec) && (strchr("/\\:",*(fnmex-1))==NULL)) {
- fnmex--;
- }
-
- /* get file name and length */
- for (fnlen=i=0; fnmex[i] && fnmex[i]!= '.' && i<MAXFILE-1; i++) {
- fname[i] = fnmex[i];
- fnlen++;
- }
- fname[fnlen] = '\0';
-
- /* get file ext and len */
- while (fnmex[i] && fnmex[i]!='.') {
- i++;
- }
- if (fnmex[i] == '.')
- i++;
- for (felen=j=0; fnmex[j+i] && j<MAXEXT-2; j++) {
- fext[j] = fnmex[j+i];
- felen++;
- }
- fext[felen] = '\0';
-
- /* Three cases:
- * full filename/ext: 12345678.ABC -> 2345678A.BCX
- * full file ext: 1234567.ABC -> 1234567A.BCX
- * other: 12345678.AB -> 12345678.ABX
- */
- if ((fnlen == MAXFILE-1) && (felen == MAXEXT-2)) {
- sprintf(fnmex,"%s%c.%s%c",fname+1,fext[0],fext+1,*bext);
- } else if (felen == MAXEXT-2) {
- sprintf(fnmex,"%s%c.%s%c",fname,fext[0],fext+1,*bext);
- } else {
- sprintf(fnmex,"%s.%s%c",fname,fext,*bext);
- }
- }
-
-
- /* fninc : increment/add last char of/to fspec.
- * used with fappend (call fnappend once, then fninc many times
- */
-
- void
- fninc(fspec)
- char *fspec;
- {
- char *cp;
- int lastp,lastc;
-
- lastc = fspec[lastp = strlen(fspec)-1];
- if (strchr("012345678ABCDEFGHIJKLMNOPQRSTUVWXY",lastc) != NULL) {
- fspec[lastp]++;
- } else if (lastc == '9') {
- fspec[lastp] = 'A';
- } else if (lastc == 'Z') {
- for (cp=&fspec[lastp]; *cp=='Z' || *cp=='.'; cp--) {
- if (*cp == 'Z') {
- *cp = '0';
- }
- }
- if (strchr("012345678ABCDEFGHIJKLMNOPQRSTUVWXY",*cp) != NULL) {
- (*cp)++;
- } else if (*cp == '9') {
- *cp = 'A';
- } else {
- if (*(cp+1) == '.') cp++;
- *(cp+1) = '1';
- fnappend(fspec,"0");
- }
- } else {
- fnappend(fspec,"0");
- }
- }
- #endif
-
-
- /* Rename a file, copying it if necessary. */
-
- int
- move_file(from,to)
- char *from, *to;
- {
- char bakname[512];
- Reg1 char *s;
- Reg2 int i;
- Reg3 int fromfd;
-
- /* to stdout? */
-
- if (strEQ(to, "-")) {
- #ifdef DEBUGGING
- if (debug & 4)
- say2("Moving %s to stdout.\n", from);
- #endif
- fromfd = open(from, 0);
- if (fromfd < 0)
- fatal2("patch: internal error, can't reopen %s\n", from);
- while ((i=read(fromfd, buf, sizeof buf))!=-1 && i!=0)
- if (write(1, buf, i) == -1)
- fatal1("patch: write failed\n");
- Close(fromfd);
- return 0;
- }
-
- if (origprae) {
- Strcpy (bakname, origprae);
- Strcat(bakname, to);
- } else {
- Strcpy(bakname, to);
- #ifdef TURBOC20
- fnappend(bakname, origext?origext:ORIGEXT);
- }
-
- if (stat(to, &filestat) >= 0) { /* output file exists */
- short to_device = filestat.st_dev;
- short to_mode = filestat.st_mode;
- long to_size = filestat.st_size;
- long to_time = filestat.st_mtime;
-
- /* find a backup name that is not the same file */
- while (stat(bakname, &filestat) >= 0 &&
- to_device == filestat.st_dev &&
- to_mode == filestat.st_mode &&
- to_size == filestat.st_size &&
- to_time == filestat.st_mtime
- ) {
- fninc(bakname);
- }
- #else
- Strcat(bakname, origext?origext:ORIGEXT);
- }
- if (stat(to, &filestat) >= 0) { /* output file exists */
- dev_t to_device = filestat.st_dev;
- ino_t to_inode = filestat.st_ino;
- char *simplename = bakname;
-
- for (s=bakname; *s; s++) {
- if (*s == '/')
- simplename = s+1;
- }
- /* find a backup name that is not the same file */
- while (stat(bakname, &filestat) >= 0 &&
- to_device == filestat.st_dev &&
- to_inode == filestat.st_ino
- ) {
- for (s=simplename; *s && !islower(*s); s++) ;
- if (*s)
- *s = toupper(*s);
- else
- Strcpy(simplename, simplename+1);
- }
- #endif
- while (unlink(bakname) >= 0) ; /* while() is for benefit of Eunice */
- #ifdef DEBUGGING
- if (debug & 4)
- say3("Moving %s to %s.\n", to, bakname);
- #endif
- #ifdef TURBOC20
- copy_file(to, bakname);
- #else
- if (link(to, bakname) < 0) {
- say3("patch: can't backup %s, output is in %s\n",
- to, from);
- return -1;
- }
- #endif
- while (unlink(to) >= 0) ;
- }
- #ifdef DEBUGGING
- if (debug & 4)
- say3("Moving %s to %s.\n", from, to);
- #endif
- #ifdef TURBOC20
- copy_file(from, to);
- #else
- if (link(from, to) < 0) { /* different file system? */
- Reg4 int tofd;
-
- tofd = creat(to, 0666);
- if (tofd < 0) {
- say3("patch: can't create %s, output is in %s.\n",
- to, from);
- return -1;
- }
- fromfd = open(from, 0);
- if (fromfd < 0)
- fatal2("patch: internal error, can't reopen %s\n", from);
- while ((i=read(fromfd, buf, sizeof buf))!=-1 && i!=0)
- if (write(tofd, buf, i) == -1)
- fatal1("patch: write failed\n");
- Close(fromfd);
- Close(tofd);
- }
- #endif
- Unlink(from);
- return 0;
- }
-
- /* Copy a file. */
-
- void
- copy_file(from,to)
- char *from, *to;
- {
- Reg3 int tofd;
- Reg2 int fromfd;
- Reg1 int i;
-
- tofd = creat(to, 0666);
- if (tofd < 0)
- fatal2("patch: can't create %s.\n", to);
- fromfd = open(from, 0);
- if (fromfd < 0)
- fatal2("patch: internal error, can't reopen %s\n", from);
- while ((i=read(fromfd, buf, sizeof buf))!=-1 && i!=0)
- if (write(tofd, buf, i) == -1)
- fatal2("patch: write (%s) failed\n", to);
- Close(fromfd);
- Close(tofd);
- }
-
- /* Allocate a unique area for a string. */
-
- char *
- savestr(s)
- Reg1 char *s;
- {
- Reg3 char *rv;
- Reg2 char *t;
-
- if (!s)
- s = "Oops";
- t = s;
- while (*t++);
- rv = malloc((MEM) (t - s));
- if (rv == Nullch) {
- if (using_plan_a)
- out_of_mem = TRUE;
- else
- fatal1("patch: out of memory (savestr)\n");
- }
- else {
- t = rv;
- while (*t++ = *s++);
- }
- return rv;
- }
-
- #if defined(lint) && defined(CANVARARG)
-
- /*VARARGS ARGSUSED*/
- say(pat) char *pat; { ; }
- /*VARARGS ARGSUSED*/
- fatal(pat) char *pat; { ; }
- /*VARARGS ARGSUSED*/
- ask(pat) char *pat; { ; }
-
- #else
-
- /* Vanilla terminal output (buffered). */
-
- void
- say(pat,arg1,arg2,arg3)
- char *pat;
- long arg1,arg2,arg3;
- {
- fprintf(stderr, pat, arg1, arg2, arg3);
- Fflush(stderr);
- }
-
- /* Terminal output, pun intended. */
-
- void /* very void */
- fatal(pat,arg1,arg2,arg3)
- char *pat;
- long arg1,arg2,arg3;
- {
- void my_exit();
-
- say(pat, arg1, arg2, arg3);
- my_exit(1);
- }
-
- /* Get a response from the user, somehow or other. */
-
- void
- ask(pat,arg1,arg2,arg3)
- char *pat;
- long arg1,arg2,arg3;
- {
- int ttyfd;
- int r;
- bool tty2 = isatty(2);
-
- Sprintf(buf, pat, arg1, arg2, arg3);
- Fflush(stderr);
- write(2, buf, strlen(buf));
- if (tty2) { /* might be redirected to a file */
- r = read(2, buf, sizeof buf);
- }
- else if (isatty(1)) { /* this may be new file output */
- Fflush(stdout);
- write(1, buf, strlen(buf));
- r = read(1, buf, sizeof buf);
- }
- else if ((ttyfd = open("/dev/tty", 2)) >= 0 && isatty(ttyfd)) {
- /* might be deleted or unwriteable */
- write(ttyfd, buf, strlen(buf));
- r = read(ttyfd, buf, sizeof buf);
- Close(ttyfd);
- }
- else if (isatty(0)) { /* this is probably patch input */
- Fflush(stdin);
- write(0, buf, strlen(buf));
- r = read(0, buf, sizeof buf);
- }
- else { /* no terminal at all--default it */
- buf[0] = '\n';
- r = 1;
- }
- if (r <= 0)
- buf[0] = 0;
- else
- buf[r] = '\0';
- if (!tty2)
- say1(buf);
- }
- #endif /* lint */
-
- /* How to handle certain events when not in a critical region. */
-
- void
- set_signals(reset)
- int reset;
- {
- void my_exit();
- #ifndef lint
- #ifdef TURBOC20
- #ifdef VOIDSIG
- static void (*intval)();
- #else
- static int (*intval)();
- #endif
- #else
- #ifdef VOIDSIG
- static void (*hupval)(),(*intval)();
- #else
- static int (*hupval)(),(*intval)();
- #endif
- #endif
-
- if (!reset) {
- #ifndef TURBOC20
- hupval = signal(SIGHUP, SIG_IGN);
- if (hupval != SIG_IGN)
- #ifdef VOIDSIG
- hupval = my_exit;
- #else
- hupval = (int(*)())my_exit;
- #endif
- #endif
-
- intval = signal(SIGINT, SIG_IGN);
- if (intval != SIG_IGN)
- #ifdef VOIDSIG
- intval = my_exit;
- #else
- intval = (int(*)())my_exit;
- #endif
- }
- #ifndef TURBOC20
- Signal(SIGHUP, hupval);
- #endif
- Signal(SIGINT, intval);
- #endif
- }
-
- /* How to handle certain events when in a critical region. */
-
- void
- ignore_signals()
- {
- #ifndef lint
- #ifndef TURBOC20
- Signal(SIGHUP, SIG_IGN);
- #endif
- Signal(SIGINT, SIG_IGN);
- #endif
- }
-
- /* Make sure we'll have the directories to create a file. */
-
- void
- makedirs(filename,striplast)
- Reg1 char *filename;
- bool striplast;
- {
- char tmpbuf[256];
- Reg2 char *s = tmpbuf;
- char *dirv[20];
- Reg3 int i;
- Reg4 int dirvp = 0;
-
- while (*filename) {
- if (*filename == '/') {
- filename++;
- dirv[dirvp++] = s;
- *s++ = '\0';
- }
- else {
- *s++ = *filename++;
- }
- }
- *s = '\0';
- dirv[dirvp] = s;
- if (striplast)
- dirvp--;
- if (dirvp < 0)
- return;
- strcpy(buf, "mkdir");
- s = buf;
- for (i=0; i<=dirvp; i++) {
- while (*s) s++;
- *s++ = ' ';
- strcpy(s, tmpbuf);
- *dirv[i] = '/';
- }
- system(buf);
- }
-
- /* Make filenames more reasonable. */
-
- char *
- fetchname(at,strip_leading,assume_exists)
- char *at;
- int strip_leading;
- int assume_exists;
- {
- char *s;
- char *name;
- Reg1 char *t;
- char tmpbuf[200];
-
- if (!at)
- return Nullch;
- s = savestr(at);
- for (t=s; isspace(*t); t++) ;
- name = t;
- #ifdef DEBUGGING
- if (debug & 128)
- say4("fetchname %s %d %d\n",name,strip_leading,assume_exists);
- #endif
- if (strnEQ(name, "/dev/null", 9)) /* so files can be created by diffing */
- return Nullch; /* against /dev/null. */
- for (; *t && !isspace(*t); t++)
- if (*t == '/')
- if (--strip_leading >= 0)
- name = t+1;
- *t = '\0';
- if (name != s && *s != '/') {
- name[-1] = '\0';
- if (stat(s, &filestat) && filestat.st_mode & S_IFDIR) {
- name[-1] = '/';
- name=s;
- }
- }
- name = savestr(name);
- Sprintf(tmpbuf, "RCS/%s", name);
- free(s);
- if (stat(name, &filestat) < 0 && !assume_exists) {
- Strcat(tmpbuf, RCSSUFFIX);
- if (stat(tmpbuf, &filestat) < 0 && stat(tmpbuf+4, &filestat) < 0) {
- Sprintf(tmpbuf, "SCCS/%s%s", SCCSPREFIX, name);
- if (stat(tmpbuf, &filestat) < 0 && stat(tmpbuf+5, &filestat) < 0) {
- free(name);
- name = Nullch;
- }
- }
- }
- return name;
- }
-