Annotation of src/usr.bin/sed/main.c, Revision 1.42
1.42 ! naddy 1: /* $OpenBSD: main.c,v 1.41 2020/10/13 06:07:54 martijn Exp $ */
1.3 deraadt 2:
1.1 deraadt 3: /*-
4: * Copyright (c) 1992 Diomidis Spinellis.
5: * Copyright (c) 1992, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Diomidis Spinellis of Imperial College, University of London.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
1.8 millert 19: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #include <sys/types.h>
1.24 deraadt 37: #include <sys/ioctl.h>
1.19 jasper 38: #include <sys/stat.h>
1.1 deraadt 39:
40: #include <ctype.h>
41: #include <errno.h>
42: #include <fcntl.h>
1.15 millert 43: #include <limits.h>
1.1 deraadt 44: #include <regex.h>
45: #include <stddef.h>
46: #include <stdio.h>
47: #include <stdlib.h>
48: #include <string.h>
49: #include <unistd.h>
1.19 jasper 50: #include <libgen.h>
1.1 deraadt 51:
52: #include "defs.h"
53: #include "extern.h"
54:
55: /*
56: * Linked list of units (strings and files) to be compiled
57: */
58: struct s_compunit {
59: struct s_compunit *next;
60: enum e_cut {CU_FILE, CU_STRING} type;
61: char *s; /* Pointer to string or fname */
62: };
63:
64: /*
65: * Linked list pointer to compilation units and pointer to current
66: * next pointer.
67: */
68: static struct s_compunit *script, **cu_nextp = &script;
69:
70: /*
71: * Linked list of files to be processed
72: */
73: struct s_flist {
74: char *fname;
75: struct s_flist *next;
76: };
77:
78: /*
79: * Linked list pointer to files and pointer to current
80: * next pointer.
81: */
82: static struct s_flist *files, **fl_nextp = &files;
83:
1.19 jasper 84: FILE *infile; /* Current input file */
85: FILE *outfile; /* Current output file */
86:
1.16 djm 87: int Eflag, aflag, eflag, nflag;
1.19 jasper 88: static int rval; /* Exit status */
1.1 deraadt 89:
90: /*
91: * Current file and line number; line numbers restart across compilation
1.19 jasper 92: * units, but span across input files. The latter is optional if editing
93: * in place.
1.1 deraadt 94: */
1.19 jasper 95: const char *fname; /* File name. */
96: const char *outfname; /* Output file name */
97: static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */
98: static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */
99: char *inplace; /* Inplace edit file extension */
1.1 deraadt 100: u_long linenum;
101:
1.6 millert 102: static void add_compunit(enum e_cut, char *);
103: static void add_file(char *);
1.21 jasper 104: static int next_files_have_lines(void);
1.1 deraadt 105:
1.24 deraadt 106: int termwidth;
107:
1.35 martijn 108: int pledge_wpath, pledge_rpath;
109:
1.1 deraadt 110: int
1.9 deraadt 111: main(int argc, char *argv[])
1.1 deraadt 112: {
1.24 deraadt 113: struct winsize win;
1.1 deraadt 114: int c, fflag;
1.24 deraadt 115: char *p;
1.1 deraadt 116:
117: fflag = 0;
1.19 jasper 118: inplace = NULL;
119: while ((c = getopt(argc, argv, "Eae:f:i::nru")) != -1)
1.1 deraadt 120: switch (c) {
1.16 djm 121: case 'E':
122: case 'r':
123: Eflag = 1;
124: break;
1.1 deraadt 125: case 'a':
126: aflag = 1;
127: break;
128: case 'e':
129: eflag = 1;
130: add_compunit(CU_STRING, optarg);
131: break;
132: case 'f':
133: fflag = 1;
134: add_compunit(CU_FILE, optarg);
135: break;
1.19 jasper 136: case 'i':
137: inplace = optarg ? optarg : "";
138: break;
1.1 deraadt 139: case 'n':
140: nflag = 1;
141: break;
1.11 ray 142: case 'u':
1.18 millert 143: setvbuf(stdout, NULL, _IOLBF, 0);
1.11 ray 144: break;
1.1 deraadt 145: default:
146: case '?':
147: (void)fprintf(stderr,
1.22 jmc 148: "usage: sed [-aEnru] [-i[extension]] command [file ...]\n"
149: " sed [-aEnru] [-e command] [-f command_file] [-i[extension]] [file ...]\n");
1.1 deraadt 150: exit(1);
151: }
152: argc -= optind;
153: argv += optind;
1.24 deraadt 154:
1.32 bentley 155: termwidth = 0;
156: if ((p = getenv("COLUMNS")) != NULL)
1.24 deraadt 157: termwidth = strtonum(p, 0, INT_MAX, NULL);
1.32 bentley 158: if (termwidth == 0 && ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == 0 &&
1.24 deraadt 159: win.ws_col > 0)
160: termwidth = win.ws_col;
161: if (termwidth == 0)
1.32 bentley 162: termwidth = 80;
1.37 martijn 163: if (termwidth <= 8)
164: termwidth = 1;
165: else
166: termwidth -= 8;
1.25 deraadt 167:
168: if (inplace != NULL) {
1.33 semarie 169: if (pledge("stdio rpath wpath cpath fattr chown", NULL) == -1)
1.30 jca 170: error(FATAL, "pledge: %s", strerror(errno));
1.25 deraadt 171: } else {
1.27 deraadt 172: if (pledge("stdio rpath wpath cpath", NULL) == -1)
1.30 jca 173: error(FATAL, "pledge: %s", strerror(errno));
1.25 deraadt 174: }
1.1 deraadt 175:
176: /* First usage case; script is the first arg */
177: if (!eflag && !fflag && *argv) {
178: add_compunit(CU_STRING, *argv);
179: argv++;
180: }
181:
182: compile();
183:
184: /* Continue with first and start second usage */
1.35 martijn 185: if (*argv) {
186: if (!pledge_wpath && inplace == NULL) {
187: if (pledge("stdio rpath", NULL) == -1)
188: error(FATAL, "pledge: %s", strerror(errno));
189: }
1.1 deraadt 190: for (; *argv; argv++)
191: add_file(*argv);
1.35 martijn 192: } else {
193: if (!pledge_wpath && !pledge_rpath) {
194: if (pledge("stdio", NULL) == -1)
195: error(FATAL, "pledge: %s", strerror(errno));
196: } else if (pledge_rpath) {
197: if (pledge("stdio rpath", NULL) == -1)
198: error(FATAL, "pledge: %s", strerror(errno));
199: } else if (pledge_wpath) {
200: if (pledge("stdio wpath cpath", NULL) == -1)
201: error(FATAL, "pledge: %s", strerror(errno));
202: }
1.1 deraadt 203: add_file(NULL);
1.35 martijn 204: }
1.1 deraadt 205: process();
206: cfclose(prog, NULL);
207: if (fclose(stdout))
1.29 mmcc 208: error(FATAL, "stdout: %s", strerror(errno));
1.19 jasper 209: exit (rval);
1.1 deraadt 210: }
211:
212: /*
213: * Like fgets, but go through the chain of compilation units chaining them
214: * together. Empty strings and files are ignored.
215: */
216: char *
1.15 millert 217: cu_fgets(char **outbuf, size_t *outsize)
1.1 deraadt 218: {
219: static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
220: static FILE *f; /* Current open file */
221: static char *s; /* Current pointer inside string */
222: static char string_ident[30];
1.13 millert 223: size_t len;
1.1 deraadt 224: char *p;
225:
1.15 millert 226: if (*outbuf == NULL)
227: *outsize = 0;
228:
1.1 deraadt 229: again:
230: switch (state) {
231: case ST_EOF:
232: if (script == NULL)
233: return (NULL);
234: linenum = 0;
235: switch (script->type) {
236: case CU_FILE:
237: if ((f = fopen(script->s, "r")) == NULL)
1.29 mmcc 238: error(FATAL,
1.1 deraadt 239: "%s: %s", script->s, strerror(errno));
240: fname = script->s;
241: state = ST_FILE;
242: goto again;
243: case CU_STRING:
1.36 millert 244: len = snprintf(string_ident, sizeof(string_ident),
245: "\"%s\"", script->s);
246: if (len >= sizeof(string_ident))
1.7 deraadt 247: strlcpy(string_ident +
248: sizeof(string_ident) - 6, " ...\"", 5);
1.1 deraadt 249: fname = string_ident;
250: s = script->s;
251: state = ST_STRING;
252: goto again;
253: }
254: case ST_FILE:
1.42 ! naddy 255: if (getline(outbuf, outsize, f) != -1) {
! 256: p = *outbuf;
1.1 deraadt 257: linenum++;
1.13 millert 258: if (linenum == 1 && p[0] == '#' && p[1] == 'n')
1.1 deraadt 259: nflag = 1;
1.13 millert 260: return (*outbuf);
1.1 deraadt 261: }
262: script = script->next;
263: (void)fclose(f);
264: state = ST_EOF;
265: goto again;
266: case ST_STRING:
267: if (linenum == 0 && s[0] == '#' && s[1] == 'n')
268: nflag = 1;
1.13 millert 269: p = *outbuf;
1.15 millert 270: len = *outsize;
1.1 deraadt 271: for (;;) {
1.15 millert 272: if (len <= 1) {
273: *outbuf = xrealloc(*outbuf,
274: *outsize + _POSIX2_LINE_MAX);
275: p = *outbuf + *outsize - len;
276: len += _POSIX2_LINE_MAX;
277: *outsize += _POSIX2_LINE_MAX;
1.1 deraadt 278: }
279: switch (*s) {
280: case '\0':
281: state = ST_EOF;
282: if (s == script->s) {
283: script = script->next;
284: goto again;
285: } else {
286: script = script->next;
287: *p = '\0';
288: linenum++;
1.13 millert 289: return (*outbuf);
1.1 deraadt 290: }
291: case '\n':
292: *p++ = '\n';
293: *p = '\0';
294: s++;
295: linenum++;
1.13 millert 296: return (*outbuf);
1.1 deraadt 297: default:
298: *p++ = *s++;
1.15 millert 299: len--;
1.1 deraadt 300: }
301: }
302: }
1.34 krw 303:
304: return (NULL);
1.1 deraadt 305: }
306:
1.38 martijn 307: void
308: finish_file(void)
309: {
310: if (infile != NULL) {
311: fclose(infile);
312: if (*oldfname != '\0') {
313: if (rename(fname, oldfname) != 0) {
314: warning("rename()");
315: unlink(tmpfname);
316: exit(1);
317: }
318: *oldfname = '\0';
319: }
320: if (*tmpfname != '\0') {
321: if (outfile != NULL && outfile != stdout)
322: fclose(outfile);
323: outfile = NULL;
324: rename(tmpfname, fname);
325: *tmpfname = '\0';
326: }
327: outfname = NULL;
328: }
329: }
330:
1.1 deraadt 331: /*
332: * Like fgets, but go through the list of files chaining them together.
333: * Set len to the length of the line.
334: */
335: int
1.9 deraadt 336: mf_fgets(SPACE *sp, enum e_spflag spflag)
1.1 deraadt 337: {
1.19 jasper 338: struct stat sb;
1.1 deraadt 339: size_t len;
1.41 martijn 340: char dirbuf[PATH_MAX];
1.42 ! naddy 341: static char *p;
! 342: static size_t psize;
1.19 jasper 343: int c, fd;
1.40 schwarze 344: static int firstfile;
345:
346: if (infile == NULL) {
347: /* stdin? */
348: if (files->fname == NULL) {
349: if (inplace != NULL)
350: error(FATAL, "-i may not be used with stdin");
351: infile = stdin;
352: fname = "stdin";
353: outfile = stdout;
354: outfname = "stdout";
355: }
356:
357: firstfile = 1;
358: }
1.1 deraadt 359:
1.19 jasper 360: for (;;) {
361: if (infile != NULL && (c = getc(infile)) != EOF) {
362: (void)ungetc(c, infile);
363: break;
364: }
1.40 schwarze 365: /* If we are here then either eof or no files are open yet */
366: if (infile == stdin) {
367: sp->len = 0;
368: return (0);
369: }
1.38 martijn 370: finish_file();
1.19 jasper 371: if (firstfile == 0)
372: files = files->next;
373: else
374: firstfile = 0;
375: if (files == NULL) {
376: sp->len = 0;
377: return (0);
378: }
379: fname = files->fname;
380: if (inplace != NULL) {
381: if (lstat(fname, &sb) != 0)
1.30 jca 382: error(FATAL, "%s: %s", fname,
1.23 sthen 383: strerror(errno ? errno : EIO));
1.19 jasper 384: if (!S_ISREG(sb.st_mode))
1.29 mmcc 385: error(FATAL, "%s: %s %s", fname,
1.19 jasper 386: "in-place editing only",
387: "works for regular files");
388: if (*inplace != '\0') {
389: strlcpy(oldfname, fname,
390: sizeof(oldfname));
391: len = strlcat(oldfname, inplace,
392: sizeof(oldfname));
393: if (len > sizeof(oldfname))
1.29 mmcc 394: error(FATAL, "%s: name too long", fname);
1.1 deraadt 395: }
1.41 martijn 396: strlcpy(dirbuf, fname, sizeof(dirbuf));
397: len = snprintf(tmpfname, sizeof(tmpfname),
398: "%s/sedXXXXXXXXXX", dirname(dirbuf));
1.19 jasper 399: if (len >= sizeof(tmpfname))
1.29 mmcc 400: error(FATAL, "%s: name too long", fname);
1.19 jasper 401: if ((fd = mkstemp(tmpfname)) == -1)
1.31 tb 402: error(FATAL, "%s: %s", fname, strerror(errno));
1.19 jasper 403: if ((outfile = fdopen(fd, "w")) == NULL) {
404: unlink(tmpfname);
1.29 mmcc 405: error(FATAL, "%s", fname);
1.19 jasper 406: }
407: fchown(fileno(outfile), sb.st_uid, sb.st_gid);
408: fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
409: outfname = tmpfname;
410: linenum = 0;
1.38 martijn 411: resetstate();
1.19 jasper 412: } else {
413: outfile = stdout;
414: outfname = "stdout";
415: }
416: if ((infile = fopen(fname, "r")) == NULL) {
1.34 krw 417: warning("%s", strerror(errno));
1.19 jasper 418: rval = 1;
419: continue;
1.1 deraadt 420: }
421: }
422:
423: /*
1.19 jasper 424: * We are here only when infile is open and we still have something
425: * to read from it.
426: *
1.42 ! naddy 427: * Use getline() so that we can handle essentially infinite input
! 428: * data. The p and psize are static so each invocation gives
! 429: * getline() the same buffer which is expanded as needed.
1.1 deraadt 430: */
1.42 ! naddy 431: len = getline(&p, &psize, infile);
! 432: if ((ssize_t)len == -1)
! 433: error(FATAL, "%s: %s", fname, strerror(errno));
1.19 jasper 434: if (len != 0 && p[len - 1] == '\n') {
435: sp->append_newline = 1;
436: len--;
437: } else if (!lastline()) {
438: sp->append_newline = 1;
439: } else {
440: sp->append_newline = 0;
441: }
1.1 deraadt 442: cspace(sp, p, len, spflag);
443:
444: linenum++;
1.19 jasper 445:
1.1 deraadt 446: return (1);
447: }
448:
449: /*
450: * Add a compilation unit to the linked list
451: */
452: static void
1.9 deraadt 453: add_compunit(enum e_cut type, char *s)
1.1 deraadt 454: {
455: struct s_compunit *cu;
456:
457: cu = xmalloc(sizeof(struct s_compunit));
458: cu->type = type;
459: cu->s = s;
460: cu->next = NULL;
461: *cu_nextp = cu;
462: cu_nextp = &cu->next;
463: }
464:
465: /*
466: * Add a file to the linked list
467: */
468: static void
1.9 deraadt 469: add_file(char *s)
1.1 deraadt 470: {
471: struct s_flist *fp;
472:
473: fp = xmalloc(sizeof(struct s_flist));
474: fp->next = NULL;
475: *fl_nextp = fp;
476: fp->fname = s;
477: fl_nextp = &fp->next;
1.19 jasper 478: }
479:
480:
481: static int
482: next_files_have_lines()
483: {
1.20 deraadt 484: struct s_flist *file;
485: FILE *file_fd;
486: int ch;
487:
488: file = files;
489: while ((file = file->next) != NULL) {
490: if ((file_fd = fopen(file->fname, "r")) == NULL)
491: continue;
1.19 jasper 492:
1.20 deraadt 493: if ((ch = getc(file_fd)) != EOF) {
494: /*
495: * This next file has content, therefore current
496: * file doesn't contains the last line.
497: */
498: ungetc(ch, file_fd);
499: fclose(file_fd);
500: return (1);
501: }
502: fclose(file_fd);
503: }
504: return (0);
1.19 jasper 505: }
506:
507: int
508: lastline(void)
509: {
510: int ch;
511:
512: if (feof(infile)) {
513: return !(
514: (inplace == NULL) &&
515: next_files_have_lines());
516: }
517: if ((ch = getc(infile)) == EOF) {
518: return !(
519: (inplace == NULL) &&
520: next_files_have_lines());
521: }
522: ungetc(ch, infile);
523: return (0);
1.1 deraadt 524: }
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