362 lines
7.1 KiB
C
362 lines
7.1 KiB
C
#include "EXTERN.h"
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#include "common.h"
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#include "INTERN.h"
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#include "util.h"
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/* Rename a file, copying it if necessary. */
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int
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move_file(from,to)
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char *from, *to;
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{
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char bakname[512];
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Reg1 char *s;
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Reg2 int i;
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Reg3 int fromfd;
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/* to stdout? */
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if (strEQ(to, "-")) {
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#ifdef DEBUGGING
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if (debug & 4)
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say2("Moving %s to stdout.\n", from);
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#endif
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fromfd = open(from, 0);
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if (fromfd < 0)
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fatal2("patch: internal error, can't reopen %s\n", from);
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while ((i=read(fromfd, buf, sizeof buf)) > 0)
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if (write(1, buf, i) != i)
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fatal1("patch: write failed\n");
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Close(fromfd);
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return 0;
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}
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if (origprae) {
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Strcpy (bakname, origprae);
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Strcat(bakname, to);
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} else {
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Strcpy(bakname, to);
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Strcat(bakname, origext?origext:ORIGEXT);
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}
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if (stat(to, &filestat) >= 0) { /* output file exists */
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dev_t to_device = filestat.st_dev;
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ino_t to_inode = filestat.st_ino;
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char *simplename = bakname;
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for (s=bakname; *s; s++) {
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if (*s == '/')
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simplename = s+1;
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}
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/* find a backup name that is not the same file */
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while (stat(bakname, &filestat) >= 0 &&
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to_device == filestat.st_dev && to_inode == filestat.st_ino) {
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for (s=simplename; *s && !islower(*s); s++) ;
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if (*s)
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*s = toupper(*s);
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else
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Strcpy(simplename, simplename+1);
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}
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while (unlink(bakname) >= 0) ; /* while() is for benefit of Eunice */
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#ifdef DEBUGGING
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if (debug & 4)
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say3("Moving %s to %s.\n", to, bakname);
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#endif
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if (link(to, bakname) < 0) {
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say3("patch: can't backup %s, output is in %s\n",
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to, from);
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return -1;
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}
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while (unlink(to) >= 0) ;
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}
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#ifdef DEBUGGING
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if (debug & 4)
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say3("Moving %s to %s.\n", from, to);
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#endif
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if (link(from, to) < 0) { /* different file system? */
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Reg4 int tofd;
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tofd = creat(to, 0666);
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if (tofd < 0) {
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say3("patch: can't create %s, output is in %s.\n",
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to, from);
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return -1;
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}
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fromfd = open(from, 0);
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if (fromfd < 0)
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fatal2("patch: internal error, can't reopen %s\n", from);
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while ((i=read(fromfd, buf, sizeof buf)) > 0)
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if (write(tofd, buf, i) != i)
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fatal1("patch: write failed\n");
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Close(fromfd);
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Close(tofd);
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}
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Unlink(from);
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return 0;
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}
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/* Copy a file. */
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void
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copy_file(from,to)
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char *from, *to;
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{
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Reg3 int tofd;
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Reg2 int fromfd;
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Reg1 int i;
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tofd = creat(to, 0666);
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if (tofd < 0)
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fatal2("patch: can't create %s.\n", to);
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fromfd = open(from, 0);
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if (fromfd < 0)
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fatal2("patch: internal error, can't reopen %s\n", from);
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while ((i=read(fromfd, buf, sizeof buf)) > 0)
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if (write(tofd, buf, i) != i)
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fatal2("patch: write (%s) failed\n", to);
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Close(fromfd);
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Close(tofd);
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}
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/* Allocate a unique area for a string. */
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char *
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savestr(s)
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Reg1 char *s;
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{
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Reg3 char *rv;
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Reg2 char *t;
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if (!s)
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s = "Oops";
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t = s;
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while (*t++);
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rv = (char *)malloc((MEM) (t - s));
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if (rv == Nullch) {
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if (using_plan_a)
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out_of_mem = TRUE;
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else
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fatal1("patch: out of memory (savestr)\n");
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}
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else {
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t = rv;
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while (*t++ = *s++);
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}
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return rv;
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}
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#if defined(lint) && defined(CANVARARG)
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/*VARARGS ARGSUSED*/
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say(pat) char *pat; { ; }
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/*VARARGS ARGSUSED*/
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fatal(pat) char *pat; { ; }
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/*VARARGS ARGSUSED*/
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ask(pat) char *pat; { ; }
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#else
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/* Vanilla terminal output (buffered). */
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void
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say(pat,arg1,arg2,arg3)
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char *pat;
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long arg1,arg2,arg3;
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{
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fprintf(stderr, pat, arg1, arg2, arg3);
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Fflush(stderr);
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}
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/* Terminal output, pun intended. */
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void /* very void */
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fatal(pat,arg1,arg2,arg3)
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char *pat;
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long arg1,arg2,arg3;
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{
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say(pat, arg1, arg2, arg3);
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my_exit(1);
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}
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/* Get a response from the user, somehow or other. */
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void
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ask(pat,arg1,arg2,arg3)
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char *pat;
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long arg1,arg2,arg3;
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{
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int ttyfd;
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int r;
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bool tty2 = isatty(2);
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Sprintf(buf, pat, arg1, arg2, arg3);
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Fflush(stderr);
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write(2, buf, strlen(buf));
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if (tty2) { /* might be redirected to a file */
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r = read(2, buf, sizeof buf);
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}
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else if (isatty(1)) { /* this may be new file output */
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Fflush(stdout);
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write(1, buf, strlen(buf));
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r = read(1, buf, sizeof buf);
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}
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else if ((ttyfd = open("/dev/tty", 2)) >= 0 && isatty(ttyfd)) {
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/* might be deleted or unwriteable */
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write(ttyfd, buf, strlen(buf));
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r = read(ttyfd, buf, sizeof buf);
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Close(ttyfd);
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}
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else if (isatty(0)) { /* this is probably patch input */
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Fflush(stdin);
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write(0, buf, strlen(buf));
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r = read(0, buf, sizeof buf);
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}
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else { /* no terminal at all--default it */
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buf[0] = '\n';
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r = 1;
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}
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if (r <= 0)
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buf[0] = 0;
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else
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buf[r] = '\0';
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if (!tty2)
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say1(buf);
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}
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#endif /* lint */
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/* How to handle certain events when not in a critical region. */
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void
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set_signals(reset)
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int reset;
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{
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#ifndef lint
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#ifdef VOIDSIG
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static void (*hupval)(),(*intval)();
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#else
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static int (*hupval)(),(*intval)();
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#endif
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if (!reset) {
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hupval = signal(SIGHUP, SIG_IGN);
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if (hupval != SIG_IGN)
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#ifdef VOIDSIG
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hupval = my_exit;
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#else
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hupval = (int(*)())my_exit;
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#endif
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intval = signal(SIGINT, SIG_IGN);
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if (intval != SIG_IGN)
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#ifdef VOIDSIG
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intval = my_exit;
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#else
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intval = (int(*)())my_exit;
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#endif
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}
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Signal(SIGHUP, hupval);
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Signal(SIGINT, intval);
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#endif
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}
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/* How to handle certain events when in a critical region. */
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void
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ignore_signals()
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{
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#ifndef lint
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Signal(SIGHUP, SIG_IGN);
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Signal(SIGINT, SIG_IGN);
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#endif
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}
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/* Make sure we'll have the directories to create a file. */
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void
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makedirs(filename,striplast)
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Reg1 char *filename;
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bool striplast;
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{
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char tmpbuf[256];
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Reg2 char *s = tmpbuf;
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char *dirv[20];
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Reg3 int i;
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Reg4 int dirvp = 0;
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while (*filename) {
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if (*filename == '/') {
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filename++;
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dirv[dirvp++] = s;
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*s++ = '\0';
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}
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else {
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*s++ = *filename++;
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}
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}
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*s = '\0';
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dirv[dirvp] = s;
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if (striplast)
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dirvp--;
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if (dirvp < 0)
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return;
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strcpy(buf, "mkdir");
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s = buf;
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for (i=0; i<=dirvp; i++) {
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while (*s) s++;
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*s++ = ' ';
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strcpy(s, tmpbuf);
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*dirv[i] = '/';
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}
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system(buf);
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}
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/* Make filenames more reasonable. */
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char *
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fetchname(at,strip_leading,assume_exists)
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char *at;
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int strip_leading;
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int assume_exists;
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{
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char *s;
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char *name;
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Reg1 char *t;
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char tmpbuf[200];
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if (!at)
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return Nullch;
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s = savestr(at);
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for (t=s; isspace(*t); t++) ;
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name = t;
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#ifdef DEBUGGING
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if (debug & 128)
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say4("fetchname %s %d %d\n",name,strip_leading,assume_exists);
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#endif
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if (strnEQ(name, "/dev/null", 9)) /* so files can be created by diffing */
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return Nullch; /* against /dev/null. */
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for (; *t && !isspace(*t); t++)
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if (*t == '/')
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if (--strip_leading >= 0)
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name = t+1;
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*t = '\0';
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if (name != s && *s != '/') {
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name[-1] = '\0';
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if (stat(s, &filestat) && filestat.st_mode & S_IFDIR) {
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name[-1] = '/';
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name=s;
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}
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}
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name = savestr(name);
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Sprintf(tmpbuf, "RCS/%s", name);
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free(s);
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if (stat(name, &filestat) < 0 && !assume_exists) {
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Strcat(tmpbuf, RCSSUFFIX);
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if (stat(tmpbuf, &filestat) < 0 && stat(tmpbuf+4, &filestat) < 0) {
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Sprintf(tmpbuf, "SCCS/%s%s", SCCSPREFIX, name);
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if (stat(tmpbuf, &filestat) < 0 && stat(tmpbuf+5, &filestat) < 0) {
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free(name);
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name = Nullch;
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}
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}
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}
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return name;
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}
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