1 /* $Header: inp.c,v 2.0.1.1 88/06/03 15:06:13 lwall Locked $
4 * Revision 2.0.1.1 88/06/03 15:06:13 lwall
5 * patch10: made a little smarter about sccs files
7 * Revision 2.0 86/09/17 15:37:02 lwall
8 * Baseline for netwide release.
19 /* Input-file-with-indexable-lines abstract type */
21 static long i_size; /* size of the input file */
22 static char *i_womp; /* plan a buffer for entire file */
23 static char **i_ptr; /* pointers to lines in i_womp */
25 static int tifd = -1; /* plan b virtual string array */
26 static char *tibuf[2]; /* plan b buffers */
27 static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */
28 static LINENUM lines_per_buf; /* how many lines per buffer */
29 static int tireclen; /* length of records in tmp file */
31 /* New patch--prepare to edit another file. */
39 if (i_ptr != Null(char**))
45 i_ptr = Null(char **);
48 using_plan_a = TRUE; /* maybe the next one is smaller */
53 tibuf[0] = tibuf[1] = Nullch;
54 tiline[0] = tiline[1] = -1;
59 /* Constuct the line index, somehow or other. */
65 if (!plan_a(filename))
68 say3("Patching file %s using Plan %s...\n", filename,
69 (using_plan_a ? "A" : "B") );
73 /* Try keeping everything in memory. */
82 char lbuf[MAXLINELEN];
84 statfailed = stat(filename, &filestat);
85 if (statfailed && ok_to_create_file) {
87 say2("(Creating file %s...)\n",filename);
88 makedirs(filename, TRUE);
89 close(creat(filename, 0666));
90 statfailed = stat(filename, &filestat);
92 /* For nonexistent or read-only files, look for RCS or SCCS versions. */
94 /* No one can write to it. */
95 || (filestat.st_mode & 0222) == 0
96 /* I can't write to it. */
97 || ((filestat.st_mode & 0022) == 0 && filestat.st_uid != myuid)) {
103 filebase = basename(filename);
104 pathlen = filebase - filename;
106 /* Put any leading path into `s'.
107 Leave room in lbuf for the diff command. */
109 strncpy(s, filename, pathlen);
111 #define try(f, a1, a2) (Sprintf(s + pathlen, f, a1, a2), stat(s, &cstat) == 0)
112 if ( try("RCS/%s%s", filebase, RCSSUFFIX)
113 || try("RCS/%s" , filebase, 0)
114 || try( "%s%s", filebase, RCSSUFFIX)) {
115 Sprintf(buf, CHECKOUT, filename);
116 Sprintf(lbuf, RCSDIFF, filename);
118 } else if ( try("SCCS/%s%s", SCCSPREFIX, filebase)
119 || try( "%s%s", SCCSPREFIX, filebase)) {
120 Sprintf(buf, GET, s);
121 Sprintf(lbuf, SCCSDIFF, s, filename);
123 } else if (statfailed)
124 fatal2("can't find %s\n", filename);
125 /* else we can't write to it but it's not under a version
126 control system, so just proceed. */
129 if ((filestat.st_mode & 0222) != 0)
130 /* The owner can write to it. */
131 fatal3("file %s seems to be locked by somebody else under %s\n",
133 /* It might be checked out unlocked. See if it's safe to
134 check out the default version locked. */
136 say3("Comparing file %s to default %s version...\n",
139 fatal3("can't check out file %s: differs from default %s version\n",
143 say3("Checking out file %s from %s...\n", filename, cs);
144 if (system(buf) || stat(filename, &filestat))
145 fatal3("can't check out file %s from %s\n", filename, cs);
148 filemode = filestat.st_mode;
149 if (!S_ISREG(filemode))
150 fatal2("%s is not a normal file--can't patch\n", filename);
151 i_size = filestat.st_size;
153 set_hunkmax(); /* make sure dynamic arrays are allocated */
155 return FALSE; /* force plan b because plan a bombed */
160 i_womp = malloc((MEM)(i_size+2)); /* lint says this may alloc less than */
161 /* i_size, but that's okay, I think. */
163 if (i_womp == Nullch)
165 if ((ifd = open(filename, 0)) < 0)
166 pfatal2("can't open file %s", filename);
168 if (read(ifd, i_womp, (int)i_size) != i_size) {
169 Close(ifd); /* probably means i_size > 15 or 16 bits worth */
170 free(i_womp); /* at this point it doesn't matter if i_womp was */
171 return FALSE; /* undersized. */
175 if (i_size && i_womp[i_size-1] != '\n')
176 i_womp[i_size++] = '\n';
177 i_womp[i_size] = '\0';
179 /* count the lines in the buffer so we know how many pointers we need */
182 for (s=i_womp; *s; s++) {
187 i_ptr = Null(char**);
189 i_ptr = (char **)malloc((MEM)((iline + 2) * sizeof(char *)));
191 if (i_ptr == Null(char **)) { /* shucks, it was a near thing */
192 free((char *)i_womp);
196 /* now scan the buffer and build pointer array */
199 i_ptr[iline] = i_womp;
200 for (s=i_womp; *s; s++) {
202 i_ptr[++iline] = s+1; /* these are NOT null terminated */
204 input_lines = iline - 1;
206 /* now check for revision, if any */
208 if (revision != Nullch) {
209 if (!rev_in_string(i_womp)) {
213 "Warning: this file doesn't appear to be the %s version--patching anyway.\n",
218 "this file doesn't appear to be the %s version--aborting.\n", revision);
222 "This file doesn't appear to be the %s version--patch anyway? [n] ",
229 say2("Good. This file appears to be the %s version.\n",
232 return TRUE; /* plan a will work */
235 /* Keep (virtually) nothing in memory. */
244 Reg4 bool found_revision = (revision == Nullch);
246 using_plan_a = FALSE;
247 if ((ifp = fopen(filename, "r")) == Nullfp)
248 pfatal2("can't open file %s", filename);
249 if ((tifd = creat(TMPINNAME, 0666)) < 0)
250 pfatal2("can't open file %s", TMPINNAME);
251 while (fgets(buf, sizeof buf, ifp) != Nullch) {
252 if (revision != Nullch && !found_revision && rev_in_string(buf))
253 found_revision = TRUE;
254 if ((i = strlen(buf)) > maxlen)
255 maxlen = i; /* find longest line */
257 if (revision != Nullch) {
258 if (!found_revision) {
262 "Warning: this file doesn't appear to be the %s version--patching anyway.\n",
267 "this file doesn't appear to be the %s version--aborting.\n", revision);
271 "This file doesn't appear to be the %s version--patch anyway? [n] ",
278 say2("Good. This file appears to be the %s version.\n",
281 Fseek(ifp, 0L, 0); /* rewind file */
282 lines_per_buf = BUFFERSIZE / maxlen;
284 tibuf[0] = malloc((MEM)(BUFFERSIZE + 1));
285 tibuf[1] = malloc((MEM)(BUFFERSIZE + 1));
286 if (tibuf[1] == Nullch)
287 fatal1("out of memory\n");
289 if (! (i % lines_per_buf)) /* new block */
290 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
291 pfatal1("can't write temp file");
292 if (fgets(tibuf[0] + maxlen * (i%lines_per_buf), maxlen + 1, ifp)
295 if (i % lines_per_buf)
296 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
297 pfatal1("can't write temp file");
303 if ((tifd = open(TMPINNAME, 0)) < 0) {
304 pfatal2("can't reopen file %s", TMPINNAME);
308 /* Fetch a line from the input file, \n terminated, not necessarily \0. */
311 ifetch(line,whichbuf)
313 int whichbuf; /* ignored when file in memory */
315 if (line < 1 || line > input_lines)
320 LINENUM offline = line % lines_per_buf;
321 LINENUM baseline = line - offline;
323 if (tiline[0] == baseline)
325 else if (tiline[1] == baseline)
328 tiline[whichbuf] = baseline;
329 #ifndef lint /* complains of long accuracy */
330 Lseek(tifd, (long)baseline / lines_per_buf * BUFFERSIZE, 0);
332 if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0)
333 pfatal2("error reading tmp file %s", TMPINNAME);
335 return tibuf[whichbuf] + (tireclen*offline);
339 /* True if the string argument contains the revision number we want. */
342 rev_in_string(string)
348 if (revision == Nullch)
350 patlen = strlen(revision);
351 if (strnEQ(string,revision,patlen) && isspace(string[patlen]))
353 for (s = string; *s; s++) {
354 if (isspace(*s) && strnEQ(s+1, revision, patlen) &&
355 isspace(s[patlen+1] )) {