Annotation of src/usr.bin/patch/inp.c, Revision 1.1.1.1
1.1 deraadt 1: #ifndef lint
2: static char rcsid[] = "$Id: inp.c,v 1.2 1993/08/02 17:55:16 mycroft Exp $";
3: #endif /* not lint */
4:
5: #include "EXTERN.h"
6: #include "common.h"
7: #include "util.h"
8: #include "pch.h"
9: #include "INTERN.h"
10: #include "inp.h"
11:
12: /* Input-file-with-indexable-lines abstract type */
13:
14: static long i_size; /* size of the input file */
15: static char *i_womp; /* plan a buffer for entire file */
16: static char **i_ptr; /* pointers to lines in i_womp */
17:
18: static int tifd = -1; /* plan b virtual string array */
19: static char *tibuf[2]; /* plan b buffers */
20: static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */
21: static LINENUM lines_per_buf; /* how many lines per buffer */
22: static int tireclen; /* length of records in tmp file */
23:
24: /* New patch--prepare to edit another file. */
25:
26: void
27: re_input()
28: {
29: if (using_plan_a) {
30: i_size = 0;
31: #ifndef lint
32: if (i_ptr != Null(char**))
33: free((char *)i_ptr);
34: #endif
35: if (i_womp != Nullch)
36: free(i_womp);
37: i_womp = Nullch;
38: i_ptr = Null(char **);
39: }
40: else {
41: using_plan_a = TRUE; /* maybe the next one is smaller */
42: Close(tifd);
43: tifd = -1;
44: free(tibuf[0]);
45: free(tibuf[1]);
46: tibuf[0] = tibuf[1] = Nullch;
47: tiline[0] = tiline[1] = -1;
48: tireclen = 0;
49: }
50: }
51:
52: /* Constuct the line index, somehow or other. */
53:
54: void
55: scan_input(filename)
56: char *filename;
57: {
58: if (!plan_a(filename))
59: plan_b(filename);
60: if (verbose) {
61: say3("Patching file %s using Plan %s...\n", filename,
62: (using_plan_a ? "A" : "B") );
63: }
64: }
65:
66: /* Try keeping everything in memory. */
67:
68: bool
69: plan_a(filename)
70: char *filename;
71: {
72: int ifd, statfailed;
73: Reg1 char *s;
74: Reg2 LINENUM iline;
75: char lbuf[MAXLINELEN];
76:
77: statfailed = stat(filename, &filestat);
78: if (statfailed && ok_to_create_file) {
79: if (verbose)
80: say2("(Creating file %s...)\n",filename);
81: makedirs(filename, TRUE);
82: close(creat(filename, 0666));
83: statfailed = stat(filename, &filestat);
84: }
85: /* For nonexistent or read-only files, look for RCS or SCCS versions. */
86: if (statfailed
87: /* No one can write to it. */
88: || (filestat.st_mode & 0222) == 0
89: /* I can't write to it. */
90: || ((filestat.st_mode & 0022) == 0 && filestat.st_uid != myuid)) {
91: struct stat cstat;
92: char *cs = Nullch;
93: char *filebase;
94: int pathlen;
95:
96: filebase = basename(filename);
97: pathlen = filebase - filename;
98:
99: /* Put any leading path into `s'.
100: Leave room in lbuf for the diff command. */
101: s = lbuf + 20;
102: strncpy(s, filename, pathlen);
103:
104: #define try(f, a1, a2) (Sprintf(s + pathlen, f, a1, a2), stat(s, &cstat) == 0)
105: if ( try("RCS/%s%s", filebase, RCSSUFFIX)
106: || try("RCS/%s" , filebase, 0)
107: || try( "%s%s", filebase, RCSSUFFIX)) {
108: Sprintf(buf, CHECKOUT, filename);
109: Sprintf(lbuf, RCSDIFF, filename);
110: cs = "RCS";
111: } else if ( try("SCCS/%s%s", SCCSPREFIX, filebase)
112: || try( "%s%s", SCCSPREFIX, filebase)) {
113: Sprintf(buf, GET, s);
114: Sprintf(lbuf, SCCSDIFF, s, filename);
115: cs = "SCCS";
116: } else if (statfailed)
117: fatal2("can't find %s\n", filename);
118: /* else we can't write to it but it's not under a version
119: control system, so just proceed. */
120: if (cs) {
121: if (!statfailed) {
122: if ((filestat.st_mode & 0222) != 0)
123: /* The owner can write to it. */
124: fatal3("file %s seems to be locked by somebody else under %s\n",
125: filename, cs);
126: /* It might be checked out unlocked. See if it's safe to
127: check out the default version locked. */
128: if (verbose)
129: say3("Comparing file %s to default %s version...\n",
130: filename, cs);
131: if (system(lbuf))
132: fatal3("can't check out file %s: differs from default %s version\n",
133: filename, cs);
134: }
135: if (verbose)
136: say3("Checking out file %s from %s...\n", filename, cs);
137: if (system(buf) || stat(filename, &filestat))
138: fatal3("can't check out file %s from %s\n", filename, cs);
139: }
140: }
141: filemode = filestat.st_mode;
142: if (!S_ISREG(filemode))
143: fatal2("%s is not a normal file--can't patch\n", filename);
144: i_size = filestat.st_size;
145: if (out_of_mem) {
146: set_hunkmax(); /* make sure dynamic arrays are allocated */
147: out_of_mem = FALSE;
148: return FALSE; /* force plan b because plan a bombed */
149: }
150: #ifdef lint
151: i_womp = Nullch;
152: #else
153: i_womp = malloc((MEM)(i_size+2)); /* lint says this may alloc less than */
154: /* i_size, but that's okay, I think. */
155: #endif
156: if (i_womp == Nullch)
157: return FALSE;
158: if ((ifd = open(filename, 0)) < 0)
159: pfatal2("can't open file %s", filename);
160: #ifndef lint
161: if (read(ifd, i_womp, (int)i_size) != i_size) {
162: Close(ifd); /* probably means i_size > 15 or 16 bits worth */
163: free(i_womp); /* at this point it doesn't matter if i_womp was */
164: return FALSE; /* undersized. */
165: }
166: #endif
167: Close(ifd);
168: if (i_size && i_womp[i_size-1] != '\n')
169: i_womp[i_size++] = '\n';
170: i_womp[i_size] = '\0';
171:
172: /* count the lines in the buffer so we know how many pointers we need */
173:
174: iline = 0;
175: for (s=i_womp; *s; s++) {
176: if (*s == '\n')
177: iline++;
178: }
179: #ifdef lint
180: i_ptr = Null(char**);
181: #else
182: i_ptr = (char **)malloc((MEM)((iline + 2) * sizeof(char *)));
183: #endif
184: if (i_ptr == Null(char **)) { /* shucks, it was a near thing */
185: free((char *)i_womp);
186: return FALSE;
187: }
188:
189: /* now scan the buffer and build pointer array */
190:
191: iline = 1;
192: i_ptr[iline] = i_womp;
193: for (s=i_womp; *s; s++) {
194: if (*s == '\n')
195: i_ptr[++iline] = s+1; /* these are NOT null terminated */
196: }
197: input_lines = iline - 1;
198:
199: /* now check for revision, if any */
200:
201: if (revision != Nullch) {
202: if (!rev_in_string(i_womp)) {
203: if (force) {
204: if (verbose)
205: say2(
206: "Warning: this file doesn't appear to be the %s version--patching anyway.\n",
207: revision);
208: }
209: else if (batch) {
210: fatal2(
211: "this file doesn't appear to be the %s version--aborting.\n", revision);
212: }
213: else {
214: ask2(
215: "This file doesn't appear to be the %s version--patch anyway? [n] ",
216: revision);
217: if (*buf != 'y')
218: fatal1("aborted\n");
219: }
220: }
221: else if (verbose)
222: say2("Good. This file appears to be the %s version.\n",
223: revision);
224: }
225: return TRUE; /* plan a will work */
226: }
227:
228: /* Keep (virtually) nothing in memory. */
229:
230: void
231: plan_b(filename)
232: char *filename;
233: {
234: Reg3 FILE *ifp;
235: Reg1 int i = 0;
236: Reg2 int maxlen = 1;
237: Reg4 bool found_revision = (revision == Nullch);
238:
239: using_plan_a = FALSE;
240: if ((ifp = fopen(filename, "r")) == Nullfp)
241: pfatal2("can't open file %s", filename);
242: if ((tifd = creat(TMPINNAME, 0666)) < 0)
243: pfatal2("can't open file %s", TMPINNAME);
244: while (fgets(buf, sizeof buf, ifp) != Nullch) {
245: if (revision != Nullch && !found_revision && rev_in_string(buf))
246: found_revision = TRUE;
247: if ((i = strlen(buf)) > maxlen)
248: maxlen = i; /* find longest line */
249: }
250: if (revision != Nullch) {
251: if (!found_revision) {
252: if (force) {
253: if (verbose)
254: say2(
255: "Warning: this file doesn't appear to be the %s version--patching anyway.\n",
256: revision);
257: }
258: else if (batch) {
259: fatal2(
260: "this file doesn't appear to be the %s version--aborting.\n", revision);
261: }
262: else {
263: ask2(
264: "This file doesn't appear to be the %s version--patch anyway? [n] ",
265: revision);
266: if (*buf != 'y')
267: fatal1("aborted\n");
268: }
269: }
270: else if (verbose)
271: say2("Good. This file appears to be the %s version.\n",
272: revision);
273: }
274: Fseek(ifp, 0L, 0); /* rewind file */
275: lines_per_buf = BUFFERSIZE / maxlen;
276: tireclen = maxlen;
277: tibuf[0] = malloc((MEM)(BUFFERSIZE + 1));
278: tibuf[1] = malloc((MEM)(BUFFERSIZE + 1));
279: if (tibuf[1] == Nullch)
280: fatal1("out of memory\n");
281: for (i=1; ; i++) {
282: if (! (i % lines_per_buf)) /* new block */
283: if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
284: pfatal1("can't write temp file");
285: if (fgets(tibuf[0] + maxlen * (i%lines_per_buf), maxlen + 1, ifp)
286: == Nullch) {
287: input_lines = i - 1;
288: if (i % lines_per_buf)
289: if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
290: pfatal1("can't write temp file");
291: break;
292: }
293: }
294: Fclose(ifp);
295: Close(tifd);
296: if ((tifd = open(TMPINNAME, 0)) < 0) {
297: pfatal2("can't reopen file %s", TMPINNAME);
298: }
299: }
300:
301: /* Fetch a line from the input file, \n terminated, not necessarily \0. */
302:
303: char *
304: ifetch(line,whichbuf)
305: Reg1 LINENUM line;
306: int whichbuf; /* ignored when file in memory */
307: {
308: if (line < 1 || line > input_lines)
309: return "";
310: if (using_plan_a)
311: return i_ptr[line];
312: else {
313: LINENUM offline = line % lines_per_buf;
314: LINENUM baseline = line - offline;
315:
316: if (tiline[0] == baseline)
317: whichbuf = 0;
318: else if (tiline[1] == baseline)
319: whichbuf = 1;
320: else {
321: tiline[whichbuf] = baseline;
322: #ifndef lint /* complains of long accuracy */
323: Lseek(tifd, (long)baseline / lines_per_buf * BUFFERSIZE, 0);
324: #endif
325: if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0)
326: pfatal2("error reading tmp file %s", TMPINNAME);
327: }
328: return tibuf[whichbuf] + (tireclen*offline);
329: }
330: }
331:
332: /* True if the string argument contains the revision number we want. */
333:
334: bool
335: rev_in_string(string)
336: char *string;
337: {
338: Reg1 char *s;
339: Reg2 int patlen;
340:
341: if (revision == Nullch)
342: return TRUE;
343: patlen = strlen(revision);
344: if (strnEQ(string,revision,patlen) && isspace(string[patlen]))
345: return TRUE;
346: for (s = string; *s; s++) {
347: if (isspace(*s) && strnEQ(s+1, revision, patlen) &&
348: isspace(s[patlen+1] )) {
349: return TRUE;
350: }
351: }
352: return FALSE;
353: }
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