NetBSD/usr.bin/patch/inp.c

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/* $NetBSD: inp.c,v 1.10 2002/03/16 22:36:42 kristerw Exp $ */
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#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: inp.c,v 1.10 2002/03/16 22:36:42 kristerw Exp $");
#endif /* not lint */
#include "EXTERN.h"
#include "backupfile.h"
#include "common.h"
#include "util.h"
#include "pch.h"
#include "INTERN.h"
#include "inp.h"
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#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
static bool plan_a(char *);
static void plan_b(char *);
static bool rev_in_string(char *);
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/* Input-file-with-indexable-lines abstract type. */
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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 */
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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 */
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static LINENUM lines_per_buf; /* How many lines per buffer */
static int tireclen; /* Length of records in tmp file */
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/*
* New patch--prepare to edit another file.
*/
void
re_input(void)
{
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if (using_plan_a) {
i_size = 0;
if (i_ptr != NULL)
free(i_ptr);
if (i_womp != NULL)
free(i_womp);
i_womp = NULL;
i_ptr = NULL;
} 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] = NULL;
tiline[0] = tiline[1] = -1;
tireclen = 0;
}
}
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/*
* Constuct the line index, somehow or other.
*/
void
scan_input(char *filename)
{
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if (!plan_a(filename))
plan_b(filename);
if (verbose) {
say("Patching file %s using Plan %s...\n", filename,
(using_plan_a ? "A" : "B") );
}
}
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/*
* Try keeping everything in memory.
*/
static bool
plan_a(char *filename)
{
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int ifd, statfailed;
char *s;
LINENUM iline;
char lbuf[MAXLINELEN];
statfailed = stat(filename, &filestat);
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if (statfailed && ok_to_create_file) {
if (verbose)
say("(Creating file %s...)\n",filename);
makedirs(filename, TRUE);
close(creat(filename, 0666));
statfailed = stat(filename, &filestat);
}
/*
* For nonexistent or read-only files, look for RCS or SCCS
* versions.
*/
if (statfailed ||
/* 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 = NULL;
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)
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#define try1(f, a1) (Sprintf(s + pathlen, f, a1), stat(s, &cstat) == 0)
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if (try("RCS/%s%s", filebase, RCSSUFFIX) ||
try1("RCS/%s" , filebase) ||
try("%s%s", filebase, RCSSUFFIX)) {
Sprintf(buf, CHECKOUT, filename);
Sprintf(lbuf, RCSDIFF, filename);
cs = "RCS";
} else if (try("SCCS/%s%s", SCCSPREFIX, filebase) ||
try("%s%s", SCCSPREFIX, filebase)) {
Sprintf(buf, GET, s);
Sprintf(lbuf, SCCSDIFF, s, filename);
cs = "SCCS";
} else if (statfailed)
fatal("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. */
fatal(
"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)
say(
"Comparing file %s to default %s version...\n",
filename, cs);
if (system(lbuf))
fatal(
"can't check out file %s: differs from default %s version\n",
filename, cs);
}
if (verbose)
say("Checking out file %s from %s...\n",
filename, cs);
if (system(buf) || stat(filename, &filestat))
fatal("can't check out file %s from %s\n",
filename, cs);
}
}
if (old_file_is_dev_null &&
ok_to_create_file &&
(filestat.st_size != 0)) {
fatal(
"patch creates new file but existing file %s not empty\n",
filename);
}
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filemode = filestat.st_mode;
if (!S_ISREG(filemode))
fatal("%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 */
}
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i_womp = malloc(i_size + 2);
if (i_womp == NULL)
return FALSE;
if ((ifd = open(filename, 0)) < 0)
pfatal("can't open file %s", filename);
if (read(ifd, i_womp, 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;
}
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++;
}
i_ptr = malloc((iline + 2) * sizeof(char *));
if (i_ptr == NULL) { /* shucks, it was a near thing */
free(i_womp);
return FALSE;
}
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/* 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 != NULL) {
if (!rev_in_string(i_womp)) {
if (force) {
if (verbose)
say(
"Warning: this file doesn't appear to be the %s version--patching anyway.\n",
revision);
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} else if (batch) {
fatal(
"this file doesn't appear to be the %s version--aborting.\n", revision);
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} else {
ask(
"This file doesn't appear to be the %s version--patch anyway? [n] ",
revision);
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if (*buf != 'y')
fatal("aborted\n");
}
} else if (verbose)
say("Good. This file appears to be the %s version.\n",
revision);
}
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return TRUE; /* Plan a will work. */
}
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/*
* Keep (virtually) nothing in memory.
*/
static void
plan_b(char *filename)
{
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FILE *ifp;
int i = 0;
int maxlen = 1;
bool found_revision = (revision == NULL);
using_plan_a = FALSE;
if ((ifp = fopen(filename, "r")) == NULL)
pfatal("can't open file %s", filename);
if ((tifd = creat(TMPINNAME, 0666)) < 0)
pfatal("can't open file %s", TMPINNAME);
while (fgets(buf, sizeof buf, ifp) != NULL) {
if (revision != NULL && !found_revision && rev_in_string(buf))
found_revision = TRUE;
if ((i = strlen(buf)) > maxlen)
maxlen = i; /* Find longest line. */
}
if (revision != NULL) {
if (!found_revision) {
if (force) {
if (verbose)
say(
"Warning: this file doesn't appear to be the %s version--patching anyway.\n",
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revision);
} else if (batch) {
fatal(
"this file doesn't appear to be the %s version--aborting.\n", revision);
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} else {
ask(
"This file doesn't appear to be the %s version--patch anyway? [n] ",
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revision);
if (*buf != 'y')
fatal("aborted\n");
}
} else if (verbose)
say("Good. This file appears to be the %s version.\n",
revision);
}
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Fseek(ifp, 0L, 0); /* Rewind file. */
lines_per_buf = BUFFERSIZE / maxlen;
tireclen = maxlen;
tibuf[0] = malloc(BUFFERSIZE + 1);
tibuf[1] = malloc(BUFFERSIZE + 1);
if (tibuf[1] == NULL)
fatal("out of memory\n");
for (i = 1; ; i++) {
if (! (i % lines_per_buf)) /* New block. */
if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
pfatal("can't write temp file");
if (fgets(tibuf[0] + maxlen * (i % lines_per_buf),
maxlen + 1, ifp) == NULL) {
input_lines = i - 1;
if (i % lines_per_buf)
if (write(tifd, tibuf[0], BUFFERSIZE)
< BUFFERSIZE)
pfatal("can't write temp file");
break;
}
}
Fclose(ifp);
Close(tifd);
if ((tifd = open(TMPINNAME, 0)) < 0) {
pfatal("can't reopen file %s", TMPINNAME);
}
}
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/*
* Fetch a line from the input file, \n terminated, not necessarily \0.
*/
char *
ifetch(LINENUM line, int whichbuf)
{
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if (line < 1 || line > input_lines)
return "";
if (using_plan_a)
return i_ptr[line];
else {
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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;
Lseek(tifd, baseline / lines_per_buf * BUFFERSIZE, 0);
if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0)
pfatal("error reading tmp file %s", TMPINNAME);
}
return tibuf[whichbuf] + (tireclen * offline);
}
}
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/*
* True if the string argument contains the revision number we want.
*/
static bool
rev_in_string(char *string)
{
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char *s;
int patlen;
if (revision == NULL)
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;
}