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This source file includes following definitions.
- catchint
- myungetch
- mygetch
- mygetline
- askforchar
- askforreturn
- shellpath
1 /*===========================================================================
2 Copyright (c) 1998-2000, The Santa Cruz Operation
3 All rights reserved.
4
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions are met:
7
8 *Redistributions of source code must retain the above copyright notice,
9 this list of conditions and the following disclaimer.
10
11 *Redistributions in binary form must reproduce the above copyright notice,
12 this list of conditions and the following disclaimer in the documentation
13 and/or other materials provided with the distribution.
14
15 *Neither name of The Santa Cruz Operation nor the names of its contributors
16 may be used to endorse or promote products derived from this software
17 without specific prior written permission.
18
19 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
20 IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
23 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 INTERRUPTION)
27 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
30 DAMAGE.
31 =========================================================================*/
32
33 /** @file
34 * terminal input functions
35 *
36 * cscope - interactive C symbol cross-reference
37 */
38
39 #include "global-cscope.h"
40 #if defined(USE_NCURSES) && !defined(RENAMED_NCURSES)
41 #include <ncurses.h>
42 #else
43 #include <curses.h>
44 #endif
45 #include <setjmp.h> /* jmp_buf */
46 #include <stdlib.h>
47 #include <errno.h>
48 #if HAVE_SYS_TERMIOS_H
49 #include <sys/termios.h>
50 #endif
51
52 static char const rcsid[] = "$Id: input.c,v 1.2 2012/10/13 07:02:07 shigio Exp $";
53
54 static jmp_buf env; /**< setjmp/longjmp buffer */
55 static int prevchar; /**< previous, ungotten character */
56
57 /* Internal prototypes: */
58 static RETSIGTYPE catchint(int sig);
59
60 /** catch the interrupt signal */
61
62 /*ARGSUSED*/
63 static RETSIGTYPE
64 catchint(int sig)
65 {
66 (void) sig; /* 'use' it, to avoid a warning */
67
68 signal(SIGINT, catchint);
69 longjmp(env, 1);
70 }
71
72 /** unget a character */
73 void
74 myungetch(int c)
75 {
76 prevchar = c;
77 }
78
79 /** get a character from the terminal */
80 int
81 mygetch(void)
82 {
83 sighandler_t savesig; /* old value of signal */
84 int c;
85
86 /* change an interrupt signal to a break key character */
87 if (setjmp(env) == 0) {
88 savesig = signal(SIGINT, catchint);
89 refresh(); /* update the display */
90 mousereinit(); /* curses can change the menu number */
91 if(prevchar) {
92 c = prevchar;
93 prevchar = 0;
94 } else {
95 c = -1;
96 while (c == -1) {
97 /* get a character from the terminal */
98 c = getch();
99 if ((c == -1) && (errno != EINTR))
100 break;
101 }
102 }
103 } else { /* longjmp to here from signal handler */
104 c = KEY_BREAK;
105 }
106 signal(SIGINT, savesig);
107 return(c);
108 }
109
110
111 /** get a line from the terminal in non-canonical mode */
112 int
113 mygetline(char p[], char s[], unsigned size, int firstchar, BOOL iscaseless)
114 {
115 int c;
116 unsigned int i = 0, j;
117 char *sright; /* substring to the right of the cursor */
118 unsigned int ri = 0; /* position in right-string */
119
120 /* Inserts and deletes are always performed on the left-string,
121 * but we'll also have a right-string 'sright' to hold characters
122 * which are on the right of the cursor [insertion point].
123 *
124 * Think of 'sright' as a stack -- we push chars into it when the cursor
125 * moves left, and we pop chars off it when the cursor moves right again.
126 * At the end of the function, we'll pop off any remaining characters
127 * onto the end of 's'
128 */
129 sright = calloc(sizeof(char), size );
130
131 strcpy ( s, p);
132 i += strlen(p);
133 /* if a character already has been typed */
134 if (firstchar != '\0') {
135 if(iscaseless == YES) {
136 firstchar = tolower(firstchar);
137 }
138 addch(firstchar); /* display it */
139 s[i++] = firstchar; /* save it */
140 }
141 /* until the end of the line is reached */
142 while ((c = mygetch()) != '\r' && c != '\n' && c != KEY_ENTER) {
143 if (c == KEY_LEFT || c == ctrl('B')) { /* left */
144 if (i > 0) {
145 addch('\b');
146 /* move this char into the second (rhs) string */
147 sright[ri++] = s[--i];
148 }
149 } else if (c == KEY_RIGHT || c == ctrl('F')) { /* right */
150 if (i < size && ri > 0) {
151 /* move this char to the left of the cursor */
152 s[i++] = sright[--ri];
153 addch(s[i-1]);
154 }
155 } else if (
156 #ifdef KEY_HOME
157 c == KEY_HOME ||
158 #endif
159 c == ctrl('A') ) {
160 while (i > 0) {
161 sright[ri++] = s[--i];
162 addch('\b');
163 addch(s[i]);
164 addch('\b');
165 }
166 } else if (
167 #ifdef KEY_END
168 c == KEY_END ||
169 #endif
170 c == ctrl('E') ) {
171 while (ri > 0) {
172 s[i++] = sright[--ri];
173 addch(s[i-1]);
174 }
175 } else if (c == erasechar() || c == KEY_BACKSPACE
176 || c == DEL || c == ctrl('H') ) {
177 /* erase */
178 if (i > 0) {
179 if (ri == 0) {
180 addstr("\b \b");
181 } else {
182 addch('\b');
183 delch();
184 }
185 s[i] = '\0';
186 --i;
187 }
188 } else if (c == killchar() || c == KEY_BREAK) {
189 /* kill */
190 for (j = 0; j < i; ++j) {
191 addch('\b');
192 }
193 for (j = 0; j < i; ++j) {
194 addch(' ');
195 }
196 for (j = 0; j < i; ++j) {
197 addch('\b');
198 }
199 i = 0;
200 } else if (isprint(c) || c == '\t') {
201 /* printable */
202 if(iscaseless == YES) {
203 c = tolower(c);
204 }
205 /* if it will fit on the line */
206 if (i < size) {
207 s[i++] = c; /* save it */
208 if (ri == 0) {
209 addch(c); /* display it */
210 } else {
211 insch(c); /* display it */
212 addch(c); /* advance cursor */
213 }
214 }
215 #if UNIXPC
216 } else if (unixpcmouse == YES && c == ESC) { /* mouse */
217 getmouseaction(ESC); /* ignore it */
218 #endif
219 } else if (mouse == YES && c == ctrl('X')) {
220 getmouseaction(ctrl('X')); /* ignore it */
221 } else if (c == EOF) { /* end-of-file */
222 break;
223 }
224
225 /* return on an empty line to allow a command to be entered */
226 if (firstchar != '\0' && (i+ri) == 0) {
227 break;
228 }
229 }
230
231 /* move any remaining chars on the rhs of the cursor
232 * onto the end of our string
233 */
234 while (ri > 0) {
235 s[i++] = sright[--ri];
236 }
237 free(sright);
238
239 s[i] = '\0';
240 return(i);
241 }
242
243 /** ask user to enter a character after reading the message */
244
245 void
246 askforchar(void)
247 {
248 addstr("Type any character to continue: ");
249 mygetch();
250 }
251
252 /** ask user to press the @NAME{RETURN} key after reading the message */
253
254 void
255 askforreturn(void)
256 {
257 fprintf(stderr, "Press the RETURN key to continue: ");
258 getchar();
259 /* HBB 20060419: message probably messed up the screen --- redraw */
260 if (incurses == YES) {
261 redrawwin(curscr);
262 }
263 }
264
265 /** expand the @CODE{~} and @CODE{\$} shell meta characters in a path */
266
267 void
268 shellpath(char *out, int limit, char *in)
269 {
270 char *lastchar;
271 char *s, *v;
272
273 /* skip leading white space */
274 while (isspace((unsigned char)*in)) {
275 ++in;
276 }
277 lastchar = out + limit - 1;
278
279 /* a tilde (~) by itself represents $HOME; followed by a name it
280 represents the $LOGDIR of that login name */
281 if (*in == '~') {
282 *out++ = *in++; /* copy the ~ because it may not be expanded */
283
284 /* get the login name */
285 s = out;
286 while (s < lastchar && *in != '/' && *in != '\0' && !isspace((unsigned char)*in)) {
287 *s++ = *in++;
288 }
289 *s = '\0';
290
291 /* if the login name is null, then use $HOME */
292 if (*out == '\0') {
293 v = getenv("HOME");
294 } else { /* get the home directory of the login name */
295 v = logdir(out);
296 }
297 /* copy the directory name if it isn't too big */
298 if (v != NULL && strlen(v) < (lastchar - out)) {
299 strcpy(out - 1, v);
300 out += strlen(v) - 1;
301 } else {
302 /* login not found, so ~ must be part of the file name */
303 out += strlen(out);
304 }
305 }
306 /* get the rest of the path */
307 while (out < lastchar && *in != '\0' && !isspace((unsigned char)*in)) {
308
309 /* look for an environment variable */
310 if (*in == '$') {
311 *out++ = *in++; /* copy the $ because it may not be expanded */
312
313 /* get the variable name */
314 s = out;
315 while (s < lastchar && *in != '/' && *in != '\0' &&
316 !isspace((unsigned char)*in)) {
317 *s++ = *in++;
318 }
319 *s = '\0';
320
321 /* get its value, but only it isn't too big */
322 if ((v = getenv(out)) != NULL && strlen(v) < (lastchar - out)) {
323 strcpy(out - 1, v);
324 out += strlen(v) - 1;
325 } else {
326 /* var not found, or too big, so assume $ must be part of the
327 * file name */
328 out += strlen(out);
329 }
330 }
331 else { /* ordinary character */
332 *out++ = *in++;
333 }
334 }
335 *out = '\0';
336 }
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