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| Current File : //usr/src/gnu/usr.bin/patch/inp.c |
/* $FreeBSD: release/9.1.0/gnu/usr.bin/patch/inp.c 191910 2009-05-08 02:18:46Z sepotvin $
*
* $Log: inp.c,v $
* Revision 2.0.1.1 88/06/03 15:06:13 lwall
* patch10: made a little smarter about sccs files
*
* Revision 2.0 86/09/17 15:37:02 lwall
* Baseline for netwide release.
*
*/
#include "EXTERN.h"
#include "common.h"
#include "util.h"
#include "pch.h"
#include "INTERN.h"
#include "inp.h"
/* Input-file-with-indexable-lines abstract type. */
static long i_size; /* Size of the input file */
static char *i_womp; /* Plan a buffer for entire file */
static char **i_ptr; /* Pointers to lines in i_womp */
static int tifd = -1; /* Plan b virtual string array */
static char *tibuf[2]; /* Plan b buffers */
static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */
static LINENUM lines_per_buf; /* How many lines per buffer */
static int tireclen; /* Length of records in tmp file */
/*
* New patch--prepare to edit another file.
*/
void
re_input(void)
{
if (using_plan_a) {
i_size = 0;
#ifndef lint
if (i_ptr != Null(char**))
free((char *)i_ptr);
#endif
if (i_womp != Nullch)
free(i_womp);
i_womp = Nullch;
i_ptr = Null(char **);
} else {
using_plan_a = TRUE; /* maybe the next one is smaller */
Close(tifd);
tifd = -1;
free(tibuf[0]);
free(tibuf[1]);
tibuf[0] = tibuf[1] = Nullch;
tiline[0] = tiline[1] = -1;
tireclen = 0;
}
}
/*
* Constuct the line index, somehow or other.
*/
void
scan_input(char *filename)
{
if (!plan_a(filename))
plan_b(filename);
if (verbose) {
say3("Patching file %s using Plan %s...\n", filename,
(using_plan_a ? "A" : "B") );
}
}
/*
* Try keeping everything in memory.
*/
bool
plan_a(char *filename)
{
int ifd, statfailed;
Reg1 char *s;
Reg2 LINENUM iline;
char lbuf[INITLINELEN];
int output_elsewhere = strcmp(filename, outname);
extern int check_patch;
statfailed = stat(filename, &filestat);
if (statfailed && ok_to_create_file) {
if (verbose)
say2("(Creating file %s...)\n",filename);
if (check_patch)
return TRUE;
makedirs(filename, TRUE);
close(creat(filename, 0666));
statfailed = stat(filename, &filestat);
}
if (statfailed && check_patch) {
fatal2("%s not found and in check_patch mode.", filename);
}
/*
* For nonexistent or read-only files, look for RCS or SCCS
* versions.
*/
if (statfailed ||
(! output_elsewhere &&
(/* No one can write to it. */
(filestat.st_mode & 0222) == 0 ||
/* I can't write to it. */
((filestat.st_mode & 0022) == 0 && filestat.st_uid != myuid)))) {
struct stat cstat;
char *cs = Nullch;
char *filebase;
int pathlen;
filebase = basename(filename);
pathlen = filebase - filename;
/*
* Put any leading path into `s'.
* Leave room in lbuf for the diff command.
*/
s = lbuf + 20;
strncpy(s, filename, pathlen);
#define try(f,a1,a2) (Sprintf(s + pathlen, f, a1, a2), stat(s, &cstat) == 0)
if ((try("RCS/%s%s", filebase, RCSSUFFIX) ||
try("RCS/%s%s", filebase, "") ||
try("%s%s", filebase, RCSSUFFIX)) &&
/*
* Check that RCS file is not working file.
* Some hosts don't report file name length errors.
*/
(statfailed ||
((filestat.st_dev ^ cstat.st_dev) |
(filestat.st_ino ^ cstat.st_ino)))) {
Sprintf(buf, output_elsewhere?CHECKOUT:CHECKOUT_LOCKED, filename);
Sprintf(lbuf, RCSDIFF, filename);
cs = "RCS";
} else if (try("SCCS/%s%s", SCCSPREFIX, filebase) ||
try("%s%s", SCCSPREFIX, filebase)) {
Sprintf(buf, output_elsewhere?GET:GET_LOCKED, s);
Sprintf(lbuf, SCCSDIFF, s, filename);
cs = "SCCS";
} else if (statfailed)
fatal2("can't find %s\n", filename);
/*
* else we can't write to it but it's not under a version
* control system, so just proceed.
*/
if (cs) {
if (!statfailed) {
if ((filestat.st_mode & 0222) != 0)
/* The owner can write to it. */
fatal3(
"file %s seems to be locked by somebody else under %s\n",
filename, cs);
/*
* It might be checked out unlocked. See if
* it's safe to check out the default version
* locked.
*/
if (verbose)
say3(
"Comparing file %s to default %s version...\n",
filename, cs);
if (system(lbuf))
fatal3(
"can't check out file %s: differs from default %s version\n",
filename, cs);
}
if (verbose)
say3("Checking out file %s from %s...\n", filename, cs);
if (system(buf) || stat(filename, &filestat))
fatal3("can't check out file %s from %s\n",
filename, cs);
}
}
filemode = filestat.st_mode;
if (!S_ISREG(filemode))
fatal2("%s is not a normal file--can't patch\n", filename);
i_size = filestat.st_size;
if (out_of_mem) {
set_hunkmax(); /* make sure dynamic arrays are allocated */
out_of_mem = FALSE;
return FALSE; /* force plan b because plan a bombed */
}
#ifdef lint
i_womp = Nullch;
#else
/*
* Lint says this may alloc less than i_size,
* but that's okay, I think.
*/
i_womp = malloc((MEM)(i_size + 2));
#endif
if (i_womp == Nullch)
return FALSE;
if ((ifd = open(filename, 0)) < 0)
pfatal2("can't open file %s", filename);
#ifndef lint
if (read(ifd, i_womp, (int)i_size) != i_size) {
/*
* This probably means i_size > 15 or 16 bits worth. At
* this point it doesn't matter if i_womp was undersized.
*/
Close(ifd);
free(i_womp);
return FALSE;
}
#endif
Close(ifd);
if (i_size && i_womp[i_size - 1] != '\n')
i_womp[i_size++] = '\n';
i_womp[i_size] = '\0';
/*
* Count the lines in the buffer so we know how many pointers we
* need.
*/
iline = 0;
for (s = i_womp; *s; s++) {
if (*s == '\n')
iline++;
}
#ifdef lint
i_ptr = Null(char**);
#else
i_ptr = (char **)malloc((MEM)((iline + 2) * sizeof(char *)));
#endif
if (i_ptr == Null(char **)) { /* shucks, it was a near thing */
free((char *)i_womp);
return FALSE;
}
/* Now scan the buffer and build pointer array. */
iline = 1;
i_ptr[iline] = i_womp;
for (s = i_womp; *s; s++) {
if (*s == '\n') {
/* These are NOT null terminated. */
i_ptr[++iline] = s + 1;
}
}
input_lines = iline - 1;
/* Now check for revision, if any. */
if (revision != Nullch) {
if (!rev_in_string(i_womp)) {
if (force) {
if (verbose)
say2(
"Warning: this file doesn't appear to be the %s version--patching anyway.\n",
revision);
} else if (batch) {
fatal2(
"this file doesn't appear to be the %s version--aborting.\n", revision);
} else {
(void) ask2(
"This file doesn't appear to be the %s version--patch anyway? [n] ",
revision);
if (*buf != 'y')
fatal1("aborted\n");
}
} else if (verbose)
say2("Good. This file appears to be the %s version.\n",
revision);
}
return TRUE; /* Plan a will work. */
}
/*
* Keep (virtually) nothing in memory.
*/
void
plan_b(char *filename)
{
Reg3 FILE *ifp;
Reg1 int i = 0;
Reg2 int maxlen = 1;
Reg4 bool found_revision = (revision == Nullch);
using_plan_a = FALSE;
if ((ifp = fopen(filename, "r")) == Nullfp)
pfatal2("can't open file %s", filename);
if ((tifd = creat(TMPINNAME, 0666)) < 0)
pfatal2("can't open file %s", TMPINNAME);
while (fgets(buf, buf_size, ifp) != Nullch) {
if (revision != Nullch && !found_revision && rev_in_string(buf))
found_revision = TRUE;
if ((i = strlen(buf)) > maxlen)
maxlen = i; /* Find longest line. */
}
if (revision != Nullch) {
if (!found_revision) {
if (force) {
if (verbose)
say2(
"Warning: this file doesn't appear to be the %s version--patching anyway.\n",
revision);
} else if (batch) {
fatal2(
"this file doesn't appear to be the %s version--aborting.\n", revision);
} else {
(void) ask2(
"This file doesn't appear to be the %s version--patch anyway? [n] ",
revision);
if (*buf != 'y')
fatal1("aborted\n");
}
} else if (verbose)
say2("Good. This file appears to be the %s version.\n",
revision);
}
Fseek(ifp, 0L, 0); /* Rewind file. */
lines_per_buf = BUFFERSIZE / maxlen;
tireclen = maxlen;
tibuf[0] = malloc((MEM)(BUFFERSIZE + 1));
tibuf[1] = malloc((MEM)(BUFFERSIZE + 1));
if (tibuf[1] == Nullch)
fatal1("out of memory\n");
for (i = 1; ; i++) {
if (! (i % lines_per_buf)) /* New block. */
if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
pfatal1("can't write temp file");
if (fgets(tibuf[0] + maxlen * (i%lines_per_buf),
maxlen + 1, ifp) == Nullch) {
input_lines = i - 1;
if (i % lines_per_buf)
if (write(tifd, tibuf[0], BUFFERSIZE) <
BUFFERSIZE)
pfatal1("can't write temp file");
break;
}
}
Fclose(ifp);
Close(tifd);
if ((tifd = open(TMPINNAME, 0)) < 0) {
pfatal2("can't reopen file %s", TMPINNAME);
}
}
/*
* Fetch a line from the input file, \n terminated, not necessarily \0.
*/
char *
ifetch(line,whichbuf)
Reg1 LINENUM line;
int whichbuf; /* ignored when file in memory */
{
if (line < 1 || line > input_lines)
return "";
if (using_plan_a)
return i_ptr[line];
else {
LINENUM offline = line % lines_per_buf;
LINENUM baseline = line - offline;
if (tiline[0] == baseline)
whichbuf = 0;
else if (tiline[1] == baseline)
whichbuf = 1;
else {
tiline[whichbuf] = baseline;
#ifndef lint /* complains of long accuracy */
Lseek(tifd, (long)baseline / lines_per_buf * BUFFERSIZE, 0);
#endif
if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0)
pfatal2("error reading tmp file %s", TMPINNAME);
}
return tibuf[whichbuf] + (tireclen * offline);
}
}
/*
* True if the string argument contains the revision number we want.
*/
bool
rev_in_string(char *string)
{
Reg1 char *s;
Reg2 int patlen;
if (revision == Nullch)
return TRUE;
patlen = strlen(revision);
if (strnEQ(string,revision,patlen) &&
isspace((unsigned char)string[patlen]))
return TRUE;
for (s = string; *s; s++) {
if (isspace((unsigned char)*s) &&
strnEQ(s + 1, revision, patlen) &&
isspace((unsigned char)s[patlen + 1] )) {
return TRUE;
}
}
return FALSE;
}