314 lines
7.8 KiB
C
314 lines
7.8 KiB
C
/* $Header: inp.c,v 2.0 86/09/17 15:37:02 lwall Exp $
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*
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* $Log: inp.c,v $
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* Revision 2.0 86/09/17 15:37:02 lwall
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* Baseline for netwide release.
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*
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*/
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#include "EXTERN.h"
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#include "common.h"
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#include "util.h"
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#include "pch.h"
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#include "INTERN.h"
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#include "inp.h"
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/* Input-file-with-indexable-lines abstract type */
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static long i_size; /* size of the input file */
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static char *i_womp; /* plan a buffer for entire file */
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static char **i_ptr; /* pointers to lines in i_womp */
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static int tifd = -1; /* plan b virtual string array */
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static char *tibuf[2]; /* plan b buffers */
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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 */
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static int tireclen; /* length of records in tmp file */
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/* New patch--prepare to edit another file. */
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void
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re_input()
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{
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if (using_plan_a) {
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i_size = 0;
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#ifndef lint
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if (i_ptr != Null(char**))
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free((char *)i_ptr);
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#endif
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if (i_womp != Nullch)
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free(i_womp);
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i_womp = Nullch;
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i_ptr = Null(char **);
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}
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else {
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using_plan_a = TRUE; /* maybe the next one is smaller */
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Close(tifd);
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tifd = -1;
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free(tibuf[0]);
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free(tibuf[1]);
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tibuf[0] = tibuf[1] = Nullch;
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tiline[0] = tiline[1] = -1;
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tireclen = 0;
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}
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}
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/* Constuct the line index, somehow or other. */
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void
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scan_input(filename)
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char *filename;
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{
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if (!plan_a(filename))
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plan_b(filename);
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if (verbose) {
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say3("Patching file %s using Plan %s...\n", filename,
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(using_plan_a ? "A" : "B") );
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}
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}
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/* Try keeping everything in memory. */
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bool
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plan_a(filename)
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char *filename;
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{
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int ifd;
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Reg1 char *s;
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Reg2 LINENUM iline;
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if (ok_to_create_file && stat(filename, &filestat) < 0) {
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if (verbose)
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say2("(Creating file %s...)\n",filename);
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makedirs(filename, TRUE);
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close(creat(filename, 0666));
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}
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if (stat(filename, &filestat) < 0) {
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Sprintf(buf, "RCS/%s%s", filename, RCSSUFFIX);
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if (stat(buf, &filestat) >= 0 || stat(buf+4, &filestat) >= 0) {
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Sprintf(buf, CHECKOUT, filename);
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if (verbose)
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say2("Can't find %s--attempting to check it out from RCS.\n",
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filename);
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if (system(buf) || stat(filename, &filestat))
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fatal2("Can't check out %s.\n", filename);
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}
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else {
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Sprintf(buf, "SCCS/%s%s", SCCSPREFIX, filename);
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if (stat(buf, &filestat) >= 0 || stat(buf+5, &filestat) >= 0) {
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Sprintf(buf, GET, filename);
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if (verbose)
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say2("Can't find %s--attempting to get it from SCCS.\n",
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filename);
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if (system(buf) || stat(filename, &filestat))
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fatal2("Can't get %s.\n", filename);
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}
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else
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fatal2("Can't find %s.\n", filename);
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}
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}
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filemode = filestat.st_mode;
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if ((filemode & S_IFMT) & ~S_IFREG)
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fatal2("%s is not a normal file--can't patch.\n", filename);
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i_size = filestat.st_size;
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if (out_of_mem) {
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set_hunkmax(); /* make sure dynamic arrays are allocated */
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out_of_mem = FALSE;
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return FALSE; /* force plan b because plan a bombed */
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}
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#ifdef lint
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i_womp = Nullch;
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#else
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i_womp = malloc((MEM)(i_size+2)); /* lint says this may alloc less than */
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/* i_size, but that's okay, I think. */
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#endif
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if (i_womp == Nullch)
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return FALSE;
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if ((ifd = open(filename, 0)) < 0)
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fatal2("Can't open file %s\n", filename);
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#ifndef lint
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if (read(ifd, i_womp, (int)i_size) != i_size) {
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Close(ifd); /* probably means i_size > 15 or 16 bits worth */
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free(i_womp); /* at this point it doesn't matter if i_womp was */
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return FALSE; /* undersized. */
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}
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#endif
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Close(ifd);
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if (i_size && i_womp[i_size-1] != '\n')
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i_womp[i_size++] = '\n';
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i_womp[i_size] = '\0';
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/* count the lines in the buffer so we know how many pointers we need */
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iline = 0;
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for (s=i_womp; *s; s++) {
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if (*s == '\n')
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iline++;
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}
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#ifdef lint
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i_ptr = Null(char**);
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#else
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i_ptr = (char **)malloc((MEM)((iline + 2) * sizeof(char *)));
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#endif
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if (i_ptr == Null(char **)) { /* shucks, it was a near thing */
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free((char *)i_womp);
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return FALSE;
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}
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/* now scan the buffer and build pointer array */
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iline = 1;
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i_ptr[iline] = i_womp;
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for (s=i_womp; *s; s++) {
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if (*s == '\n')
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i_ptr[++iline] = s+1; /* these are NOT null terminated */
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}
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input_lines = iline - 1;
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/* now check for revision, if any */
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if (revision != Nullch) {
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if (!rev_in_string(i_womp)) {
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if (force) {
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if (verbose)
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say2("\
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Warning: this file doesn't appear to be the %s version--patching anyway.\n",
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revision);
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}
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else {
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ask2("\
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This file doesn't appear to be the %s version--patch anyway? [n] ",
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revision);
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if (*buf != 'y')
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fatal1("Aborted.\n");
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}
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}
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else if (verbose)
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say2("Good. This file appears to be the %s version.\n",
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revision);
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}
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return TRUE; /* plan a will work */
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}
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/* Keep (virtually) nothing in memory. */
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void
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plan_b(filename)
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char *filename;
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{
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Reg3 FILE *ifp;
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Reg1 int i = 0;
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Reg2 int maxlen = 1;
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Reg4 bool found_revision = (revision == Nullch);
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using_plan_a = FALSE;
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if ((ifp = fopen(filename, "r")) == Nullfp)
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fatal2("Can't open file %s\n", filename);
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if ((tifd = creat(TMPINNAME, 0666)) < 0)
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fatal2("Can't open file %s\n", TMPINNAME);
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while (fgets(buf, sizeof buf, ifp) != Nullch) {
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if (revision != Nullch && !found_revision && rev_in_string(buf))
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found_revision = TRUE;
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if ((i = strlen(buf)) > maxlen)
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maxlen = i; /* find longest line */
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}
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if (revision != Nullch) {
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if (!found_revision) {
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if (force) {
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if (verbose)
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say2("\
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Warning: this file doesn't appear to be the %s version--patching anyway.\n",
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revision);
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}
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else {
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ask2("\
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This file doesn't appear to be the %s version--patch anyway? [n] ",
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revision);
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if (*buf != 'y')
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fatal1("Aborted.\n");
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}
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}
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else if (verbose)
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say2("Good. This file appears to be the %s version.\n",
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revision);
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}
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Fseek(ifp, 0L, 0); /* rewind file */
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lines_per_buf = BUFFERSIZE / maxlen;
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tireclen = maxlen;
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tibuf[0] = malloc((MEM)(BUFFERSIZE + 1));
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tibuf[1] = malloc((MEM)(BUFFERSIZE + 1));
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if (tibuf[1] == Nullch)
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fatal1("Can't seem to get enough memory.\n");
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for (i=1; ; i++) {
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if (! (i % lines_per_buf)) /* new block */
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if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
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fatal1("patch: can't write temp file.\n");
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if (fgets(tibuf[0] + maxlen * (i%lines_per_buf), maxlen + 1, ifp)
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== Nullch) {
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input_lines = i - 1;
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if (i % lines_per_buf)
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if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
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fatal1("patch: can't write temp file.\n");
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break;
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}
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}
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Fclose(ifp);
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Close(tifd);
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if ((tifd = open(TMPINNAME, 0)) < 0) {
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fatal2("Can't reopen file %s\n", TMPINNAME);
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}
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}
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/* Fetch a line from the input file, \n terminated, not necessarily \0. */
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char *
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ifetch(line,whichbuf)
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Reg1 LINENUM line;
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int whichbuf; /* ignored when file in memory */
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{
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if (line < 1 || line > input_lines)
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return "";
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if (using_plan_a)
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return i_ptr[line];
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else {
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LINENUM offline = line % lines_per_buf;
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LINENUM baseline = line - offline;
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if (tiline[0] == baseline)
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whichbuf = 0;
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else if (tiline[1] == baseline)
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whichbuf = 1;
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else {
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tiline[whichbuf] = baseline;
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#ifndef lint /* complains of long accuracy */
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Lseek(tifd, (off_t)baseline / lines_per_buf * BUFFERSIZE, 0);
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#endif
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if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0)
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fatal2("Error reading tmp file %s.\n", TMPINNAME);
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}
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return tibuf[whichbuf] + (tireclen*offline);
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}
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}
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/* True if the string argument contains the revision number we want. */
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bool
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rev_in_string(string)
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char *string;
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{
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Reg1 char *s;
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Reg2 int patlen;
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if (revision == Nullch)
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return TRUE;
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patlen = strlen(revision);
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for (s = string; *s; s++) {
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if (isspace(*s) && strnEQ(s+1, revision, patlen) &&
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isspace(s[patlen+1] )) {
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return TRUE;
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}
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}
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return FALSE;
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}
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