+/* $Header: inp.c,v 2.0 86/09/17 15:37:02 lwall Exp $
+ *
+ * $Log: inp.c,v $
+ * 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()
+{
+ 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(filename)
+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(filename)
+char *filename;
+{
+ int ifd;
+ Reg1 char *s;
+ Reg2 LINENUM iline;
+
+ if (ok_to_create_file && stat(filename, &filestat) < 0) {
+ if (verbose)
+ say2("(Creating file %s...)\n",filename);
+ makedirs(filename, TRUE);
+ close(creat(filename, 0666));
+ }
+ if (stat(filename, &filestat) < 0) {
+ Sprintf(buf, "RCS/%s%s", filename, RCSSUFFIX);
+ if (stat(buf, &filestat) >= 0 || stat(buf+4, &filestat) >= 0) {
+ Sprintf(buf, CHECKOUT, filename);
+ if (verbose)
+ say2("Can't find %s--attempting to check it out from RCS.\n",
+ filename);
+ if (system(buf) || stat(filename, &filestat))
+ fatal2("Can't check out %s.\n", filename);
+ }
+ else {
+ Sprintf(buf, "SCCS/%s%s", SCCSPREFIX, filename);
+ if (stat(buf, &filestat) >= 0 || stat(buf+5, &filestat) >= 0) {
+ Sprintf(buf, GET, filename);
+ if (verbose)
+ say2("Can't find %s--attempting to get it from SCCS.\n",
+ filename);
+ if (system(buf) || stat(filename, &filestat))
+ fatal2("Can't get %s.\n", filename);
+ }
+ else
+ fatal2("Can't find %s.\n", filename);
+ }
+ }
+ filemode = filestat.st_mode;
+ if ((filemode & S_IFMT) & ~S_IFREG)
+ 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
+ i_womp = malloc((MEM)(i_size+2)); /* lint says this may alloc less than */
+ /* i_size, but that's okay, I think. */
+#endif
+ if (i_womp == Nullch)
+ return FALSE;
+ if ((ifd = open(filename, 0)) < 0)
+ fatal2("Can't open file %s\n", filename);
+#ifndef lint
+ if (read(ifd, i_womp, (int)i_size) != i_size) {
+ Close(ifd); /* probably means i_size > 15 or 16 bits worth */
+ free(i_womp); /* at this point it doesn't matter if i_womp was */
+ return FALSE; /* undersized. */
+ }
+#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')
+ i_ptr[++iline] = s+1; /* these are NOT null terminated */
+ }
+ 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 {
+ 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(filename)
+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)
+ fatal2("Can't open file %s\n", filename);
+ if ((tifd = creat(TMPINNAME, 0666)) < 0)
+ fatal2("Can't open file %s\n", TMPINNAME);
+ while (fgets(buf, sizeof buf, 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 {
+ 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("Can't seem to get enough memory.\n");
+ for (i=1; ; i++) {
+ if (! (i % lines_per_buf)) /* new block */
+ if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
+ fatal1("patch: can't write temp file.\n");
+ 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)
+ fatal1("patch: can't write temp file.\n");
+ break;
+ }
+ }
+ Fclose(ifp);
+ Close(tifd);
+ if ((tifd = open(TMPINNAME, 0)) < 0) {
+ fatal2("Can't reopen file %s\n", 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)
+ fatal2("Error reading tmp file %s.\n", TMPINNAME);
+ }
+ return tibuf[whichbuf] + (tireclen*offline);
+ }
+}
+
+/* True if the string argument contains the revision number we want. */
+
+bool
+rev_in_string(string)
+char *string;
+{
+ Reg1 char *s;
+ Reg2 int patlen;
+
+ if (revision == Nullch)
+ return TRUE;
+ patlen = strlen(revision);
+ for (s = string; *s; s++) {
+ if (isspace(*s) && strnEQ(s+1, revision, patlen) &&
+ isspace(s[patlen+1] )) {
+ return TRUE;
+ }
+ }
+ return FALSE;
+}
+
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