Annotation of OpenXM_contrib/gnuplot/docs/termdoc.c, Revision 1.1.1.1
1.1 maekawa 1: /*
2: * $Id: termdoc.c,v 1.19 1998/04/14 00:17:14 drd Exp $
3: *
4: */
5:
6: /* GNUPLOT - termdoc.c */
7:
8: /*[
9: * Copyright 1986 - 1993, 1998 Thomas Williams, Colin Kelley
10: *
11: * Permission to use, copy, and distribute this software and its
12: * documentation for any purpose with or without fee is hereby granted,
13: * provided that the above copyright notice appear in all copies and
14: * that both that copyright notice and this permission notice appear
15: * in supporting documentation.
16: *
17: * Permission to modify the software is granted, but not the right to
18: * distribute the complete modified source code. Modifications are to
19: * be distributed as patches to the released version. Permission to
20: * distribute binaries produced by compiling modified sources is granted,
21: * provided you
22: * 1. distribute the corresponding source modifications from the
23: * released version in the form of a patch file along with the binaries,
24: * 2. add special version identification to distinguish your version
25: * in addition to the base release version number,
26: * 3. provide your name and address as the primary contact for the
27: * support of your modified version, and
28: * 4. retain our contact information in regard to use of the base
29: * software.
30: * Permission to distribute the released version of the source code along
31: * with corresponding source modifications in the form of a patch file is
32: * granted with same provisions 2 through 4 for binary distributions.
33: *
34: * This software is provided "as is" without express or implied warranty
35: * to the extent permitted by applicable law.
36: ]*/
37:
38: /*
39: * AUTHORS
40: *
41: * David Denholm - 1996
42: */
43:
44: /* this file provides a replacement for fgets() which inserts all the
45: * help from the terminal drivers line by line at the < in the
46: * gnuplot.doc file. This way, doc2* dont need to know what's going
47: * on, and think it's all coming from one place.
48: *
49: * Can be compiled as a standalone program to generate the raw
50: * .doc test, when compiled with -DTEST_TERMDOC
51: *
52: * Strips comment lines {so none of doc2* need to bother}
53: * but magic comments beginning C# are used as markers
54: * for line number recording (as c compilers)
55: * We set BEGIN_HELP macro to "C#<driver>" as a special marker.
56: *
57: * Hmm - this is turning more and more into a preprocessor !
58: * gnuplot.doc now has multiple top-level entries, but
59: * some help systems (eg VMS) cannot tolerate this.
60: * As a complete bodge, conditional on boolean single_top_level == TRUE,
61: * we accept only the first 1, and map any subsequent 1's to 2's
62: * At present, this leaves a bogus, empty section called
63: * commands, but that's a small price to pay to get it
64: * working properly
65: */
66:
67: #ifdef HAVE_CONFIG_H
68: # include "config.h"
69: #endif
70:
71: #define DOCS_TERMDOC_MAIN
72:
73: #include "ansichek.h"
74: #include "stdfn.h"
75: #include "doc2x.h"
76:
77: /* because we hide details of including terminal drivers,
78: * we provide line numbers and file names
79: */
80:
81: int termdoc_lineno;
82: char termdoc_filename[80];
83:
84: boolean single_top_level;
85:
86: char *get_line(buffer, max, fp)
87: char *buffer;
88: int max;
89: FILE *fp;
90: {
91: static int line = -1; /* not going yet */
92: static int level = 0; /* terminals are at level 1 - we add this */
93: static int save_lineno; /* for saving lineno */
94: static int seen_a_one = 0;
95:
96: if (line == -1) {
97:
98: /* we are reading from file */
99:
100: {
101: read_another_line: /* come here if a comment is read */
102:
103: if (!fgets(buffer, max, fp))
104: return NULL; /* EOF */
105: ++termdoc_lineno;
106: if (buffer[0] == 'C') {
107: if (buffer[1] == '#') {
108: /* should not happen in gnuplot.doc, but... */
109: safe_strncpy(termdoc_filename, buffer + 2, sizeof(termdoc_filename));
110: termdoc_filename[strlen(termdoc_filename) - 1] = NUL;
111: termdoc_lineno = 0;
112: }
113: goto read_another_line; /* skip comments */
114: }
115: }
116:
117: if (single_top_level == TRUE) {
118: if (buffer[0] == '1') {
119: if (seen_a_one) {
120: buffer[0] = '2';
121: }
122: seen_a_one = 1;
123: }
124: }
125: if (buffer[0] != '<')
126: return buffer; /* the simple case */
127:
128: /* prepare to return text from the terminal drivers */
129: save_lineno = termdoc_lineno;
130: termdoc_lineno = -1; /* dont count the C# */
131: level = buffer[1] - '1';
132: line = 0;
133: }
134: /* we're sending lines from terminal help */
135:
136: /* process and skip comments. Note that the last line
137: * will invariably be a comment !
138: */
139:
140: while (termtext[line][0] == 'C') {
141: if (termtext[line][1] == '#') {
142: safe_strncpy(termdoc_filename, termtext[line] + 2, sizeof(termdoc_filename));
143: termdoc_lineno = 0;
144: }
145: ++termdoc_lineno;
146:
147: if (!termtext[++line]) {
148: /* end of text : need to return a line from
149: * the file. Recursive call is best way out
150: */
151: termdoc_lineno = save_lineno;
152: /* we've done the last line, so get next line from file */
153: line = -1;
154: return get_line(buffer, max, fp);
155: }
156: }
157:
158:
159: /* termtext[line] is the next line of text.
160: * more efficient to return pointer, but we need to modify it
161: */
162:
163: ++termdoc_lineno;
164: safe_strncpy(buffer, termtext[line], max);
165: /* dodgy; can overrun buffer; lh */
166: /* strncat(buffer, "\n", max); */
167: if (strlen(buffer) == (max - 1))
168: buffer[max-2] = '\n';
169: else
170: strcat(buffer, "\n");
171:
172: if (isdigit((int)buffer[0]))
173: buffer[0] += level;
174:
175: if (!termtext[++line]) {
176: /* end of terminal help : return to input file next time
177: * last (pseudo-)line in each terminal should be a comment,
178: * so we shouldn't get here, but...
179: */
180: termdoc_lineno = save_lineno;
181: /* we've done the last line, so get next line from file */
182: line = -1;
183: }
184: return buffer;
185: }
186:
187:
188: /* Safe, '\0'-terminated version of strncpy()
189: * safe_strncpy(dest, src, n), where n = sizeof(dest)
190: * This is basically the old fit.c(copy_max) function
191: */
192:
193: char *safe_strncpy(d, s, n)
194: char *d, *s;
195: size_t n;
196: {
197: char *ret;
198:
199: ret = strncpy(d, s, n);
200: if (strlen(s) >= n)
201: d[n-1] = NUL;
202:
203: return ret;
204: }
205:
206:
207: #ifdef TEST_TERMDOC
208: int main()
209: {
210: char line[256];
211: while (get_line(line, sizeof(line), stdin))
212: printf("%s:%d:%s", termdoc_filename, termdoc_lineno, line);
213: return 0;
214: }
215: #endif
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