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1.1 root 1: /* $Header: inp.c,v 2.0 86/09/17 15:37:02 lwall Exp $
2: *
3: * $Log: inp.c,v $
4: * Revision 2.0 86/09/17 15:37:02 lwall
5: * Baseline for netwide release.
6: *
7: */
8:
9: #include "EXTERN.h"
10: #include "common.h"
11: #include "util.h"
12: #include "pch.h"
13: #include "INTERN.h"
14: #include "inp.h"
15:
16: /* Input-file-with-indexable-lines abstract type */
17:
18: static long i_size; /* size of the input file */
19: static char *i_womp; /* plan a buffer for entire file */
20: static char **i_ptr; /* pointers to lines in i_womp */
21:
22: static int tifd = -1; /* plan b virtual string array */
23: static char *tibuf[2]; /* plan b buffers */
24: static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */
25: static LINENUM lines_per_buf; /* how many lines per buffer */
26: static int tireclen; /* length of records in tmp file */
27:
28: /* New patch--prepare to edit another file. */
29:
30: void
31: re_input()
32: {
33: if (using_plan_a) {
34: i_size = 0;
35: #ifndef lint
36: if (i_ptr != Null(char**))
37: free((char *)i_ptr);
38: #endif
39: if (i_womp != Nullch)
40: free(i_womp);
41: i_womp = Nullch;
42: i_ptr = Null(char **);
43: }
44: else {
45: using_plan_a = TRUE; /* maybe the next one is smaller */
46: Close(tifd);
47: tifd = -1;
48: free(tibuf[0]);
49: free(tibuf[1]);
50: tibuf[0] = tibuf[1] = Nullch;
51: tiline[0] = tiline[1] = -1;
52: tireclen = 0;
53: }
54: }
55:
56: /* Constuct the line index, somehow or other. */
57:
58: void
59: scan_input(filename)
60: char *filename;
61: {
62: if (!plan_a(filename))
63: plan_b(filename);
64: if (verbose) {
65: say3("Patching file %s using Plan %s...\n", filename,
66: (using_plan_a ? "A" : "B") );
67: }
68: }
69:
70: /* Try keeping everything in memory. */
71:
72: bool
73: plan_a(filename)
74: char *filename;
75: {
76: int ifd;
77: Reg1 char *s;
78: Reg2 LINENUM iline;
79:
80: if (ok_to_create_file && stat(filename, &filestat) < 0) {
81: if (verbose)
82: say2("(Creating file %s...)\n",filename);
83: makedirs(filename, TRUE);
84: close(creat(filename, 0666));
85: }
86: if (stat(filename, &filestat) < 0) {
87: Sprintf(buf, "RCS/%s%s", filename, RCSSUFFIX);
88: if (stat(buf, &filestat) >= 0 || stat(buf+4, &filestat) >= 0) {
89: Sprintf(buf, CHECKOUT, filename);
90: if (verbose)
91: say2("Can't find %s--attempting to check it out from RCS.\n",
92: filename);
93: if (system(buf) || stat(filename, &filestat))
94: fatal2("Can't check out %s.\n", filename);
95: }
96: else {
97: Sprintf(buf, "SCCS/%s%s", SCCSPREFIX, filename);
98: if (stat(buf, &filestat) >= 0 || stat(buf+5, &filestat) >= 0) {
99: Sprintf(buf, GET, filename);
100: if (verbose)
101: say2("Can't find %s--attempting to get it from SCCS.\n",
102: filename);
103: if (system(buf) || stat(filename, &filestat))
104: fatal2("Can't get %s.\n", filename);
105: }
106: else
107: fatal2("Can't find %s.\n", filename);
108: }
109: }
110: filemode = filestat.st_mode;
111: if ((filemode & S_IFMT) & ~S_IFREG)
112: fatal2("%s is not a normal file--can't patch.\n", filename);
113: i_size = filestat.st_size;
114: if (out_of_mem) {
115: set_hunkmax(); /* make sure dynamic arrays are allocated */
116: out_of_mem = FALSE;
117: return FALSE; /* force plan b because plan a bombed */
118: }
119: #ifdef lint
120: i_womp = Nullch;
121: #else
122: i_womp = malloc((MEM)(i_size+2)); /* lint says this may alloc less than */
123: /* i_size, but that's okay, I think. */
124: #endif
125: if (i_womp == Nullch)
126: return FALSE;
127: if ((ifd = open(filename, 0)) < 0)
128: fatal2("Can't open file %s\n", filename);
129: #ifndef lint
130: if (read(ifd, i_womp, (int)i_size) != i_size) {
131: Close(ifd); /* probably means i_size > 15 or 16 bits worth */
132: free(i_womp); /* at this point it doesn't matter if i_womp was */
133: return FALSE; /* undersized. */
134: }
135: #endif
136: Close(ifd);
137: if (i_size && i_womp[i_size-1] != '\n')
138: i_womp[i_size++] = '\n';
139: i_womp[i_size] = '\0';
140:
141: /* count the lines in the buffer so we know how many pointers we need */
142:
143: iline = 0;
144: for (s=i_womp; *s; s++) {
145: if (*s == '\n')
146: iline++;
147: }
148: #ifdef lint
149: i_ptr = Null(char**);
150: #else
151: i_ptr = (char **)malloc((MEM)((iline + 2) * sizeof(char *)));
152: #endif
153: if (i_ptr == Null(char **)) { /* shucks, it was a near thing */
154: free((char *)i_womp);
155: return FALSE;
156: }
157:
158: /* now scan the buffer and build pointer array */
159:
160: iline = 1;
161: i_ptr[iline] = i_womp;
162: for (s=i_womp; *s; s++) {
163: if (*s == '\n')
164: i_ptr[++iline] = s+1; /* these are NOT null terminated */
165: }
166: input_lines = iline - 1;
167:
168: /* now check for revision, if any */
169:
170: if (revision != Nullch) {
171: if (!rev_in_string(i_womp)) {
172: if (force) {
173: if (verbose)
174: say2("\
175: Warning: this file doesn't appear to be the %s version--patching anyway.\n",
176: revision);
177: }
178: else {
179: ask2("\
180: This file doesn't appear to be the %s version--patch anyway? [n] ",
181: revision);
182: if (*buf != 'y')
183: fatal1("Aborted.\n");
184: }
185: }
186: else if (verbose)
187: say2("Good. This file appears to be the %s version.\n",
188: revision);
189: }
190: return TRUE; /* plan a will work */
191: }
192:
193: /* Keep (virtually) nothing in memory. */
194:
195: void
196: plan_b(filename)
197: char *filename;
198: {
199: Reg3 FILE *ifp;
200: Reg1 int i = 0;
201: Reg2 int maxlen = 1;
202: Reg4 bool found_revision = (revision == Nullch);
203:
204: using_plan_a = FALSE;
205: if ((ifp = fopen(filename, "r")) == Nullfp)
206: fatal2("Can't open file %s\n", filename);
207: if ((tifd = creat(TMPINNAME, 0666)) < 0)
208: fatal2("Can't open file %s\n", TMPINNAME);
209: while (fgets(buf, sizeof buf, ifp) != Nullch) {
210: if (revision != Nullch && !found_revision && rev_in_string(buf))
211: found_revision = TRUE;
212: if ((i = strlen(buf)) > maxlen)
213: maxlen = i; /* find longest line */
214: }
215: if (revision != Nullch) {
216: if (!found_revision) {
217: if (force) {
218: if (verbose)
219: say2("\
220: Warning: this file doesn't appear to be the %s version--patching anyway.\n",
221: revision);
222: }
223: else {
224: ask2("\
225: This file doesn't appear to be the %s version--patch anyway? [n] ",
226: revision);
227: if (*buf != 'y')
228: fatal1("Aborted.\n");
229: }
230: }
231: else if (verbose)
232: say2("Good. This file appears to be the %s version.\n",
233: revision);
234: }
235: Fseek(ifp, 0L, 0); /* rewind file */
236: lines_per_buf = BUFFERSIZE / maxlen;
237: tireclen = maxlen;
238: tibuf[0] = malloc((MEM)(BUFFERSIZE + 1));
239: tibuf[1] = malloc((MEM)(BUFFERSIZE + 1));
240: if (tibuf[1] == Nullch)
241: fatal1("Can't seem to get enough memory.\n");
242: for (i=1; ; i++) {
243: if (! (i % lines_per_buf)) /* new block */
244: if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
245: fatal1("patch: can't write temp file.\n");
246: if (fgets(tibuf[0] + maxlen * (i%lines_per_buf), maxlen + 1, ifp)
247: == Nullch) {
248: input_lines = i - 1;
249: if (i % lines_per_buf)
250: if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
251: fatal1("patch: can't write temp file.\n");
252: break;
253: }
254: }
255: Fclose(ifp);
256: Close(tifd);
257: if ((tifd = open(TMPINNAME, 0)) < 0) {
258: fatal2("Can't reopen file %s\n", TMPINNAME);
259: }
260: }
261:
262: /* Fetch a line from the input file, \n terminated, not necessarily \0. */
263:
264: char *
265: ifetch(line,whichbuf)
266: Reg1 LINENUM line;
267: int whichbuf; /* ignored when file in memory */
268: {
269: if (line < 1 || line > input_lines)
270: return "";
271: if (using_plan_a)
272: return i_ptr[line];
273: else {
274: LINENUM offline = line % lines_per_buf;
275: LINENUM baseline = line - offline;
276:
277: if (tiline[0] == baseline)
278: whichbuf = 0;
279: else if (tiline[1] == baseline)
280: whichbuf = 1;
281: else {
282: tiline[whichbuf] = baseline;
283: #ifndef lint /* complains of long accuracy */
284: Lseek(tifd, (long)baseline / lines_per_buf * BUFFERSIZE, 0);
285: #endif
286: if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0)
287: fatal2("Error reading tmp file %s.\n", TMPINNAME);
288: }
289: return tibuf[whichbuf] + (tireclen*offline);
290: }
291: }
292:
293: /* True if the string argument contains the revision number we want. */
294:
295: bool
296: rev_in_string(string)
297: char *string;
298: {
299: Reg1 char *s;
300: Reg2 int patlen;
301:
302: if (revision == Nullch)
303: return TRUE;
304: patlen = strlen(revision);
305: for (s = string; *s; s++) {
306: if (isspace(*s) && strnEQ(s+1, revision, patlen) &&
307: isspace(s[patlen+1] )) {
308: return TRUE;
309: }
310: }
311: return FALSE;
312: }
313:
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