minix/commands/patch/util.c

362 lines
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C
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2005-04-21 16:53:53 +02:00
#include "EXTERN.h"
#include "common.h"
#include "INTERN.h"
#include "util.h"
/* 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)) > 0)
if (write(1, buf, i) != i)
fatal1("patch: write failed\n");
Close(fromfd);
return 0;
}
if (origprae) {
Strcpy (bakname, origprae);
Strcat(bakname, to);
} else {
Strcpy(bakname, to);
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);
}
while (unlink(bakname) >= 0) ; /* while() is for benefit of Eunice */
#ifdef DEBUGGING
if (debug & 4)
say3("Moving %s to %s.\n", to, bakname);
#endif
if (link(to, bakname) < 0) {
say3("patch: can't backup %s, output is in %s\n",
to, from);
return -1;
}
while (unlink(to) >= 0) ;
}
#ifdef DEBUGGING
if (debug & 4)
say3("Moving %s to %s.\n", from, to);
#endif
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)) > 0)
if (write(tofd, buf, i) != i)
fatal1("patch: write failed\n");
Close(fromfd);
Close(tofd);
}
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)) > 0)
if (write(tofd, buf, i) != i)
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 = (char *)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;
{
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;
{
#ifndef lint
#ifdef VOIDSIG
static void (*hupval)(),(*intval)();
#else
static int (*hupval)(),(*intval)();
#endif
if (!reset) {
hupval = signal(SIGHUP, SIG_IGN);
if (hupval != SIG_IGN)
#ifdef VOIDSIG
hupval = my_exit;
#else
hupval = (int(*)())my_exit;
#endif
intval = signal(SIGINT, SIG_IGN);
if (intval != SIG_IGN)
#ifdef VOIDSIG
intval = my_exit;
#else
intval = (int(*)())my_exit;
#endif
}
Signal(SIGHUP, hupval);
Signal(SIGINT, intval);
#endif
}
/* How to handle certain events when in a critical region. */
void
ignore_signals()
{
#ifndef lint
Signal(SIGHUP, SIG_IGN);
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;
}