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1 | /*- |
2 | * Copyright (c) 1991 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * This code is derived from software contributed to Berkeley by | |
6 | * Kenneth Almquist. | |
7 | * | |
8 | * %sccs.include.redist.c% | |
9 | */ | |
10 | ||
11 | #ifndef lint | |
12 | static char sccsid[] = "@(#)output.c 5.1 (Berkeley) %G%"; | |
13 | #endif /* not lint */ | |
14 | ||
15 | /* | |
16 | * Shell output routines. We use our own output routines because: | |
17 | * When a builtin command is interrupted we have to discard | |
18 | * any pending output. | |
19 | * When a builtin command appears in back quotes, we want to | |
20 | * save the output of the command in a region obtained | |
21 | * via malloc, rather than doing a fork and reading the | |
22 | * output of the command via a pipe. | |
23 | * Our output routines may be smaller than the stdio routines. | |
24 | */ | |
25 | ||
26 | #include <stdio.h> /* defines BUFSIZ */ | |
27 | #include "shell.h" | |
28 | #include "syntax.h" | |
29 | #include "output.h" | |
30 | #include "memalloc.h" | |
31 | #include "error.h" | |
32 | #ifdef __STDC__ | |
33 | #include "stdarg.h" | |
34 | #else | |
35 | #include <varargs.h> | |
36 | #endif | |
37 | #include <errno.h> | |
38 | ||
39 | ||
40 | #define OUTBUFSIZ BUFSIZ | |
41 | #define BLOCK_OUT -2 /* output to a fixed block of memory */ | |
42 | #define MEM_OUT -3 /* output to dynamically allocated memory */ | |
43 | #define OUTPUT_ERR 01 /* error occurred on output */ | |
44 | ||
45 | ||
46 | struct output output = {NULL, 0, NULL, OUTBUFSIZ, 1, 0}; | |
47 | struct output errout = {NULL, 0, NULL, 100, 2, 0};; | |
48 | struct output memout = {NULL, 0, NULL, 0, MEM_OUT, 0}; | |
49 | struct output *out1 = &output; | |
50 | struct output *out2 = &errout; | |
51 | ||
52 | ||
53 | ||
54 | #ifdef mkinit | |
55 | ||
56 | INCLUDE "output.h" | |
57 | INCLUDE "memalloc.h" | |
58 | ||
59 | RESET { | |
60 | out1 = &output; | |
61 | out2 = &errout; | |
62 | if (memout.buf != NULL) { | |
63 | ckfree(memout.buf); | |
64 | memout.buf = NULL; | |
65 | } | |
66 | } | |
67 | ||
68 | #endif | |
69 | ||
70 | ||
71 | #ifdef notdef /* no longer used */ | |
72 | /* | |
73 | * Set up an output file to write to memory rather than a file. | |
74 | */ | |
75 | ||
76 | void | |
77 | open_mem(block, length, file) | |
78 | char *block; | |
79 | int length; | |
80 | struct output *file; | |
81 | { | |
82 | file->nextc = block; | |
83 | file->nleft = --length; | |
84 | file->fd = BLOCK_OUT; | |
85 | file->flags = 0; | |
86 | } | |
87 | #endif | |
88 | ||
89 | ||
90 | void | |
91 | out1str(p) | |
92 | char *p; | |
93 | { | |
94 | outstr(p, out1); | |
95 | } | |
96 | ||
97 | ||
98 | void | |
99 | out2str(p) | |
100 | char *p; | |
101 | { | |
102 | outstr(p, out2); | |
103 | } | |
104 | ||
105 | ||
106 | void | |
107 | outstr(p, file) | |
108 | register char *p; | |
109 | register struct output *file; | |
110 | { | |
111 | while (*p) | |
112 | outc(*p++, file); | |
113 | } | |
114 | ||
115 | ||
116 | char out_junk[16]; | |
117 | ||
118 | ||
119 | void | |
120 | emptyoutbuf(dest) | |
121 | struct output *dest; | |
122 | { | |
123 | int offset; | |
124 | ||
125 | if (dest->fd == BLOCK_OUT) { | |
126 | dest->nextc = out_junk; | |
127 | dest->nleft = sizeof out_junk; | |
128 | dest->flags |= OUTPUT_ERR; | |
129 | } else if (dest->buf == NULL) { | |
130 | INTOFF; | |
131 | dest->buf = ckmalloc(dest->bufsize); | |
132 | dest->nextc = dest->buf; | |
133 | dest->nleft = dest->bufsize; | |
134 | INTON; | |
135 | } else if (dest->fd == MEM_OUT) { | |
136 | offset = dest->bufsize; | |
137 | INTOFF; | |
138 | dest->bufsize <<= 1; | |
139 | dest->buf = ckrealloc(dest->buf, dest->bufsize); | |
140 | dest->nleft = dest->bufsize - offset; | |
141 | dest->nextc = dest->buf + offset; | |
142 | INTON; | |
143 | } else { | |
144 | flushout(dest); | |
145 | } | |
146 | dest->nleft--; | |
147 | } | |
148 | ||
149 | ||
150 | void | |
151 | flushall() { | |
152 | flushout(&output); | |
153 | flushout(&errout); | |
154 | } | |
155 | ||
156 | ||
157 | void | |
158 | flushout(dest) | |
159 | struct output *dest; | |
160 | { | |
161 | ||
162 | if (dest->buf == NULL || dest->nextc == dest->buf || dest->fd < 0) | |
163 | return; | |
164 | if (xwrite(dest->fd, dest->buf, dest->nextc - dest->buf) < 0) | |
165 | dest->flags |= OUTPUT_ERR; | |
166 | dest->nextc = dest->buf; | |
167 | dest->nleft = dest->bufsize; | |
168 | } | |
169 | ||
170 | ||
171 | void | |
172 | freestdout() { | |
173 | INTOFF; | |
174 | if (output.buf) { | |
175 | ckfree(output.buf); | |
176 | output.buf = NULL; | |
177 | output.nleft = 0; | |
178 | } | |
179 | INTON; | |
180 | } | |
181 | ||
182 | ||
183 | #ifdef __STDC__ | |
184 | void | |
185 | outfmt(struct output *file, char *fmt, ...) { | |
186 | va_list ap; | |
187 | ||
188 | va_start(ap, fmt); | |
189 | doformat(file, fmt, ap); | |
190 | va_end(ap); | |
191 | } | |
192 | ||
193 | ||
194 | void | |
195 | out1fmt(char *fmt, ...) { | |
196 | va_list ap; | |
197 | ||
198 | va_start(ap, fmt); | |
199 | doformat(out1, fmt, ap); | |
200 | va_end(ap); | |
201 | } | |
202 | ||
203 | ||
204 | void | |
205 | fmtstr(char *outbuf, int length, char *fmt, ...) { | |
206 | va_list ap; | |
207 | struct output strout; | |
208 | ||
209 | va_start(ap, fmt); | |
210 | strout.nextc = outbuf; | |
211 | strout.nleft = length; | |
212 | strout.fd = BLOCK_OUT; | |
213 | strout.flags = 0; | |
214 | doformat(&strout, fmt, ap); | |
215 | outc('\0', &strout); | |
216 | if (strout.flags & OUTPUT_ERR) | |
217 | outbuf[length - 1] = '\0'; | |
218 | } | |
219 | ||
220 | #else /* not __STDC__ */ | |
221 | ||
222 | void | |
223 | outfmt(va_alist) | |
224 | va_dcl | |
225 | { | |
226 | va_list ap; | |
227 | struct output *file; | |
228 | char *fmt; | |
229 | ||
230 | va_start(ap); | |
231 | file = va_arg(ap, struct output *); | |
232 | fmt = va_arg(ap, char *); | |
233 | doformat(file, fmt, ap); | |
234 | va_end(ap); | |
235 | } | |
236 | ||
237 | ||
238 | void | |
239 | out1fmt(va_alist) | |
240 | va_dcl | |
241 | { | |
242 | va_list ap; | |
243 | char *fmt; | |
244 | ||
245 | va_start(ap); | |
246 | fmt = va_arg(ap, char *); | |
247 | doformat(out1, fmt, ap); | |
248 | va_end(ap); | |
249 | } | |
250 | ||
251 | ||
252 | void | |
253 | fmtstr(va_alist) | |
254 | va_dcl | |
255 | { | |
256 | va_list ap; | |
257 | struct output strout; | |
258 | char *outbuf; | |
259 | int length; | |
260 | char *fmt; | |
261 | ||
262 | va_start(ap); | |
263 | outbuf = va_arg(ap, char *); | |
264 | length = va_arg(ap, int); | |
265 | fmt = va_arg(ap, char *); | |
266 | strout.nextc = outbuf; | |
267 | strout.nleft = length; | |
268 | strout.fd = BLOCK_OUT; | |
269 | strout.flags = 0; | |
270 | doformat(&strout, fmt, ap); | |
271 | outc('\0', &strout); | |
272 | if (strout.flags & OUTPUT_ERR) | |
273 | outbuf[length - 1] = '\0'; | |
274 | } | |
275 | #endif /* __STDC__ */ | |
276 | ||
277 | ||
278 | /* | |
279 | * Formatted output. This routine handles a subset of the printf formats: | |
280 | * - Formats supported: d, u, o, X, s, and c. | |
281 | * - The x format is also accepted but is treated like X. | |
282 | * - The l modifier is accepted. | |
283 | * - The - and # flags are accepted; # only works with the o format. | |
284 | * - Width and precision may be specified with any format except c. | |
285 | * - An * may be given for the width or precision. | |
286 | * - The obsolete practice of preceding the width with a zero to get | |
287 | * zero padding is not supported; use the precision field. | |
288 | * - A % may be printed by writing %% in the format string. | |
289 | */ | |
290 | ||
291 | #define TEMPSIZE 24 | |
292 | ||
293 | #ifdef __STDC__ | |
294 | static const char digit[16] = "0123456789ABCDEF"; | |
295 | #else | |
296 | static const char digit[17] = "0123456789ABCDEF"; | |
297 | #endif | |
298 | ||
299 | ||
300 | void | |
301 | doformat(dest, f, ap) | |
302 | register struct output *dest; | |
303 | register char *f; /* format string */ | |
304 | va_list ap; | |
305 | { | |
306 | register char c; | |
307 | char temp[TEMPSIZE]; | |
308 | int flushleft; | |
309 | int sharp; | |
310 | int width; | |
311 | int prec; | |
312 | int islong; | |
313 | char *p; | |
314 | int sign; | |
315 | long l; | |
316 | unsigned long num; | |
317 | unsigned base; | |
318 | int len; | |
319 | int size; | |
320 | int pad; | |
321 | ||
322 | while ((c = *f++) != '\0') { | |
323 | if (c != '%') { | |
324 | outc(c, dest); | |
325 | continue; | |
326 | } | |
327 | flushleft = 0; | |
328 | sharp = 0; | |
329 | width = 0; | |
330 | prec = -1; | |
331 | islong = 0; | |
332 | for (;;) { | |
333 | if (*f == '-') | |
334 | flushleft++; | |
335 | else if (*f == '#') | |
336 | sharp++; | |
337 | else | |
338 | break; | |
339 | f++; | |
340 | } | |
341 | if (*f == '*') { | |
342 | width = va_arg(ap, int); | |
343 | f++; | |
344 | } else { | |
345 | while (is_digit(*f)) { | |
346 | width = 10 * width + digit_val(*f++); | |
347 | } | |
348 | } | |
349 | if (*f == '.') { | |
350 | if (*++f == '*') { | |
351 | prec = va_arg(ap, int); | |
352 | f++; | |
353 | } else { | |
354 | prec = 0; | |
355 | while (is_digit(*f)) { | |
356 | prec = 10 * prec + digit_val(*f++); | |
357 | } | |
358 | } | |
359 | } | |
360 | if (*f == 'l') { | |
361 | islong++; | |
362 | f++; | |
363 | } | |
364 | switch (*f) { | |
365 | case 'd': | |
366 | if (islong) | |
367 | l = va_arg(ap, long); | |
368 | else | |
369 | l = va_arg(ap, int); | |
370 | sign = 0; | |
371 | num = l; | |
372 | if (l < 0) { | |
373 | num = -l; | |
374 | sign = 1; | |
375 | } | |
376 | base = 10; | |
377 | goto number; | |
378 | case 'u': | |
379 | base = 10; | |
380 | goto uns_number; | |
381 | case 'o': | |
382 | base = 8; | |
383 | goto uns_number; | |
384 | case 'x': | |
385 | /* we don't implement 'x'; treat like 'X' */ | |
386 | case 'X': | |
387 | base = 16; | |
388 | uns_number: /* an unsigned number */ | |
389 | sign = 0; | |
390 | if (islong) | |
391 | num = va_arg(ap, unsigned long); | |
392 | else | |
393 | num = va_arg(ap, unsigned int); | |
394 | number: /* process a number */ | |
395 | p = temp + TEMPSIZE - 1; | |
396 | *p = '\0'; | |
397 | while (num) { | |
398 | *--p = digit[num % base]; | |
399 | num /= base; | |
400 | } | |
401 | len = (temp + TEMPSIZE - 1) - p; | |
402 | if (prec < 0) | |
403 | prec = 1; | |
404 | if (sharp && *f == 'o' && prec <= len) | |
405 | prec = len + 1; | |
406 | pad = 0; | |
407 | if (width) { | |
408 | size = len; | |
409 | if (size < prec) | |
410 | size = prec; | |
411 | size += sign; | |
412 | pad = width - size; | |
413 | if (flushleft == 0) { | |
414 | while (--pad >= 0) | |
415 | outc(' ', dest); | |
416 | } | |
417 | } | |
418 | if (sign) | |
419 | outc('-', dest); | |
420 | prec -= len; | |
421 | while (--prec >= 0) | |
422 | outc('0', dest); | |
423 | while (*p) | |
424 | outc(*p++, dest); | |
425 | while (--pad >= 0) | |
426 | outc(' ', dest); | |
427 | break; | |
428 | case 's': | |
429 | p = va_arg(ap, char *); | |
430 | pad = 0; | |
431 | if (width) { | |
432 | len = strlen(p); | |
433 | if (prec >= 0 && len > prec) | |
434 | len = prec; | |
435 | pad = width - len; | |
436 | if (flushleft == 0) { | |
437 | while (--pad >= 0) | |
438 | outc(' ', dest); | |
439 | } | |
440 | } | |
441 | prec++; | |
442 | while (--prec != 0 && *p) | |
443 | outc(*p++, dest); | |
444 | while (--pad >= 0) | |
445 | outc(' ', dest); | |
446 | break; | |
447 | case 'c': | |
448 | c = va_arg(ap, int); | |
449 | outc(c, dest); | |
450 | break; | |
451 | default: | |
452 | outc(*f, dest); | |
453 | break; | |
454 | } | |
455 | f++; | |
456 | } | |
457 | } | |
458 | ||
459 | ||
460 | ||
461 | /* | |
462 | * Version of write which resumes after a signal is caught. | |
463 | */ | |
464 | ||
465 | int | |
466 | xwrite(fd, buf, nbytes) | |
467 | int fd; | |
468 | char *buf; | |
469 | int nbytes; | |
470 | { | |
471 | int ntry; | |
472 | int i; | |
473 | int n; | |
474 | ||
475 | n = nbytes; | |
476 | ntry = 0; | |
477 | for (;;) { | |
478 | i = write(fd, buf, n); | |
479 | if (i > 0) { | |
480 | if ((n -= i) <= 0) | |
481 | return nbytes; | |
482 | buf += i; | |
483 | ntry = 0; | |
484 | } else if (i == 0) { | |
485 | if (++ntry > 10) | |
486 | return nbytes - n; | |
487 | } else if (errno != EINTR) { | |
488 | return -1; | |
489 | } | |
490 | } | |
491 | } | |
492 | ||
493 | ||
494 | /* | |
495 | * Version of ioctl that retries after a signal is caught. | |
496 | */ | |
497 | ||
498 | int | |
499 | xioctl(fd, request, arg) { | |
500 | int i; | |
501 | ||
502 | while ((i = ioctl(fd, request, arg)) == -1 && errno == EINTR); | |
503 | return i; | |
504 | } |