source: trunk/minix/commands/cawf/string.c@ 10

Last change on this file since 10 was 9, checked in by Mattia Monga, 14 years ago

Minix 3.1.2a
File size: 6.9 KB
Line 
1/*
2 * string.c - string support functions for cawf(1)
3 */
4
5/*
6 * Copyright (c) 1991 Purdue University Research Foundation,
7 * West Lafayette, Indiana 47907. All rights reserved.
8 *
9 * Written by Victor A. Abell <abe@mace.cc.purdue.edu>, Purdue
10 * University Computing Center. Not derived from licensed software;
11 * derived from awf(1) by Henry Spencer of the University of Toronto.
12 *
13 * Permission is granted to anyone to use this software for any
14 * purpose on any computer system, and to alter it and redistribute
15 * it freely, subject to the following restrictions:
16 *
17 * 1. The author is not responsible for any consequences of use of
18 * this software, even if they arise from flaws in it.
19 *
20 * 2. The origin of this software must not be misrepresented, either
21 * by explicit claim or by omission. Credits must appear in the
22 * documentation.
23 *
24 * 3. Altered versions must be plainly marked as such, and must not
25 * be misrepresented as being the original software. Credits must
26 * appear in the documentation.
27 *
28 * 4. This notice may not be removed or altered.
29 */
30
31#include "cawf.h"
32#include <ctype.h>
33
34_PROTOTYPE(static void Setroman,());
35
36
37/*
38 * Asmname(s, c) - assemble name
39 */
40
41Asmname(s, c)
42 unsigned char *s; /* pointer to name */
43 unsigned char *c; /* code destination (c[3]) */
44{
45
46 c[1] = c[2] = '\0';
47 while (*s && *s == ' ')
48 s++;
49 if ((c[0] = *s) == '\0')
50 return(0);
51 return(((c[1] = s[1]) == '\0') ? 1 : 2);
52}
53
54
55/*
56 * Delstr(sx) - delete string
57 */
58
59void
60Delstr(sx)
61 int sx; /* string index */
62{
63 char buf[MAXLINE]; /* message buffer */
64
65 if (sx >= Nstr) {
66 (void) sprintf(buf, " bad Delstr(%d) index", sx);
67 Error(FATAL, LINE, buf, NULL);
68 }
69 Free(&Str[sx].str);
70 while (sx < (Nstr - 1)) {
71 Str[sx] = Str[sx + 1];
72 sx++;
73 }
74 Nstr--;
75}
76
77
78/*
79 * Endword() - end a word
80 */
81
82void
83Endword()
84{
85 if (Fontstat != 'R')
86 Setroman();
87 Word[Wordx] = '\0';
88}
89
90
91/*
92 * Findchar(nm, l, s, e) - find special character definition and
93 * optionally enter it
94 */
95
96Findchar(nm, l, s, e)
97 unsigned char *nm; /* character name */
98 int l; /* effective length */
99 unsigned char *s; /* value string */
100 int e; /* 0 = find, don't enter
101 * 1 = don't find, enter */
102{
103 int cmp, hi, low, mid;
104 unsigned char c[3];
105
106 c[0] = nm[0];
107 c[1] = (nm[1] == ' ' || nm[1] == '\t') ? '\0' : nm[1];
108 c[2] = '\0';
109 low = mid = 0;
110 hi = Nsch - 1;
111 while (low <= hi) {
112 mid = (low + hi) / 2;
113 if ((cmp = strncmp((char *)c, (char *)Schar[mid].nm, 2)) < 0)
114 hi = mid - 1;
115 else if (cmp > 0)
116 low = mid + 1;
117 else {
118 if ( ! e)
119 return(mid);
120 Free(&Schar[mid].str);
121 goto new_char;
122 }
123 }
124 if ( ! e)
125 return(-1);
126 if (Nsch >= MAXSCH)
127 Error(FATAL, LINE, " at character table limit", NULL);
128 if (Nsch) {
129 if (cmp > 0)
130 mid++;
131 for (hi = Nsch - 1; hi >= mid; hi--)
132 Schar[hi+1] = Schar[hi];
133 }
134 Nsch++;
135 Schar[mid].nm[0] = c[0];
136 Schar[mid].nm[1] = c[1];
137
138new_char:
139
140 Schar[mid].str = Newstr(s);
141 Schar[mid].len = l;
142 return(mid);
143}
144
145
146/*
147 * Findhy(s, l, e) - find and optionally enter hyphen
148 */
149
150Findhy(s, l, e)
151 unsigned char *s; /* value string */
152 int l; /* equivalent length */
153 int e; /* 0 = find, don't enter
154 * 1 = enter, don't find */
155{
156 int i;
157
158 for (i = 0; i < Nhy; i++) {
159 if (Font[0] == Hychar[i].font)
160 break;
161 }
162 if (i >= Nhy) {
163 if ( ! e)
164 return(-1);
165 if (Nhy >= MAXHYCH)
166 Error(FATAL, LINE, " at hyphen limit for font ",
167 (char *)Font);
168 Hychar[i].font = Font[0];
169 Nhy++;
170 } else {
171 if ( ! e)
172 return(i);
173 Error(WARN, LINE, " duplicate hyphen for font ", (char *)Font);
174 Free(&Hychar[i].str);
175 }
176 Hychar[i].str = Newstr(s);
177 Hychar[i].len = l;
178 return(i);
179}
180
181
182/*
183 * Findstr(nm, s, e) - find and optionally enter string in Str[]
184 */
185
186unsigned char *
187Findstr(nm, s, e)
188 unsigned char *nm; /* 2 character string name */
189 unsigned char *s; /* string value */
190 int e; /* 0 = find, don't enter
191 * 1 = enter, don't find */
192{
193 unsigned char c[3]; /* character buffer */
194 int cmp, hi, low, mid; /* binary search controls */
195 int i; /* temporary indexes */
196 unsigned char *s1, *s2; /* temporary string pointers */
197
198 c[0] = nm[0];
199 c[1] = (nm[1] == ' ' || nm[1] == '\t') ? '\0' : nm[1];
200 c[2] = '\0';
201 low = mid = 0;
202 hi = Nstr - 1;
203 Sx = -1;
204 while (low <= hi) {
205 mid = (low + hi) / 2;
206 if ((cmp = strncmp((char *)c, (char *)Str[mid].nm, 2)) < 0)
207 hi = mid - 1;
208 else if (cmp > 0)
209 low = mid + 1;
210 else {
211 Sx = mid;
212 if ( ! e)
213 return(Str[mid].str);
214 Free(&Str[mid].str);
215 goto new_string;
216 }
217 }
218 if ( ! e)
219 return((unsigned char *)"");
220 if (Nstr >= MAXSTR)
221 Error(FATAL, LINE, " out of space for string ", (char *)c);
222 if (Nstr) {
223 if (cmp > 0)
224 mid++;
225 for (hi = Nstr - 1; hi >= mid; hi--)
226 Str[hi+1] = Str[hi];
227 }
228 Nstr++;
229 Sx = mid;
230 Str[mid].nm[0] = c[0];
231 Str[mid].nm[1] = c[1];
232
233new_string:
234
235 if (s == NULL)
236 return (Str[mid].str = Newstr((unsigned char *)""));
237 i = (*s == '"') ? 1 : 0;
238 s1 = Str[mid].str = Newstr(s + i);
239 if (i) {
240 s2 = s1 + strlen((char *)s1);
241 if (s2 > s1 && *(s2-1) == '"')
242 *(s2-1) = '\0';
243 }
244 return(s1);
245}
246
247
248/*
249 * Setroman() - set Roman font
250 */
251
252static void
253Setroman()
254{
255 int i;
256
257 if ((Wordx + Fstr.rl) >= MAXLINE)
258 Error(WARN, LINE, " word too long", NULL);
259 else {
260 if (Fstr.r) {
261 for (i = 0; i < Fstr.rl; i++) {
262 Word[Wordx++] = Fstr.r[i];
263 }
264 }
265 Fontstat = 'R';
266 }
267}
268
269
270/*
271 * Str2word(s, len) - copy len characters from string to Word[]
272 */
273
274Str2word(s, len)
275 unsigned char *s;
276 int len;
277{
278 int i;
279
280 for (; len > 0; len--, s++) {
281 switch (Font[0]) {
282 case 'B':
283 case 'C':
284 if (Fontctl == 0) {
285 if ((Wordx + 5) >= MAXLINE) {
286word_too_long:
287 Error(WARN, LINE, " word too long",
288 NULL);
289 return(1);
290 }
291 Word[Wordx++] = Trtbl[(int)*s];
292 Word[Wordx++] = '\b';
293 Word[Wordx++] = Trtbl[(int)*s];
294 Word[Wordx++] = '\b';
295 Word[Wordx++] = Trtbl[(int)*s];
296 break;
297 }
298 if (Fontstat != Font[0]) {
299 if (Fontstat != 'R')
300 Setroman();
301 if ((Wordx + Fstr.bl) >= MAXLINE)
302 goto word_too_long;
303 if (Fstr.b) {
304 for (i = 0; i < Fstr.bl; i++) {
305 Word[Wordx++] = Fstr.b[i];
306 }
307 }
308 Fontstat = Font[0];
309 }
310 if ((Wordx + 1) >= MAXLINE)
311 goto word_too_long;
312 Word[Wordx++] = Trtbl[(int)*s];
313 break;
314 case 'I':
315 if (isalnum(*s)) {
316 if (Fontctl == 0) {
317 if ((Wordx + 3) >= MAXLINE)
318 goto word_too_long;
319 Word[Wordx++] = '_';
320 Word[Wordx++] = '\b';
321 Word[Wordx++] = Trtbl[(int)*s];
322 break;
323 }
324 if (Fontstat != 'I') {
325 if (Fontstat != 'R')
326 Setroman();
327 if ((Wordx + Fstr.itl) >= MAXLINE)
328 goto word_too_long;
329 if (Fstr.it) {
330 for (i = 0; i < Fstr.itl; i++) {
331 Word[Wordx++] = Fstr.it[i];
332 }
333 }
334 Fontstat = 'I';
335 }
336 if ((Wordx + 1) >= MAXLINE)
337 goto word_too_long;
338 Word[Wordx++] = Trtbl[(int)*s];
339 break;
340 }
341 /* else fall through */
342 default:
343 if (Fontstat != 'R')
344 Setroman();
345 if ((Wordx + 1) >= MAXLINE)
346 goto word_too_long;
347 Word[Wordx++] = Trtbl[(int)*s];
348 }
349 }
350 return(0);
351}
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