/*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 2013 Johann 'Myrkraverk' Oskarsson. * Copyright (c) 1992 Diomidis Spinellis. * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Diomidis Spinellis of Imperial College, University of London. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/types.h> #include <sys/mman.h> #include <sys/param.h> #include <sys/stat.h> #include <err.h> #include <errno.h> #include <fcntl.h> #include <libgen.h> #include <limits.h> #include <locale.h> #include <regex.h> #include <stddef.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include "defs.h" #include "extern.h" /* * Linked list of units (strings and files) to be compiled */ struct s_compunit { struct s_compunit *next; enum e_cut {CU_FILE, CU_STRING} type; char *s; /* Pointer to string or fname */ }; /* * Linked list pointer to compilation units and pointer to current * next pointer. */ static struct s_compunit *script, **cu_nextp = &script; /* * Linked list of files to be processed */ struct s_flist { char *fname; struct s_flist *next; }; /* * Linked list pointer to files and pointer to current * next pointer. */ static struct s_flist *files, **fl_nextp = &files; FILE *infile; /* Current input file */ FILE *outfile; /* Current output file */ int aflag, eflag, nflag; int rflags = 0; int quit = 0; static int rval; /* Exit status */ static int ispan; /* Whether inplace editing spans across files */ /* * Current file and line number; line numbers restart across compilation * units, but span across input files. The latter is optional if editing * in place. */ const char *fname; /* File name. */ const char *outfname; /* Output file name */ static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */ static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */ const char *inplace; /* Inplace edit file extension. */ u_long linenum; static void add_compunit(enum e_cut, char *); static void add_file(char *); static void usage(void) __dead2; int main(int argc, char *argv[]) { int c, fflag, fflagstdin; char *temp_arg; (void) setlocale(LC_ALL, ""); fflag = 0; fflagstdin = 0; inplace = NULL; while ((c = getopt(argc, argv, "EI:ae:f:i:lnru")) != -1) switch (c) { case 'r': /* Gnu sed compat */ case 'E': rflags = REG_EXTENDED; break; case 'I': inplace = optarg; ispan = 1; /* span across input files */ break; case 'a': aflag = 1; break; case 'e': eflag = 1; if ((temp_arg = malloc(strlen(optarg) + 2)) == NULL) err(1, "malloc"); strcpy(temp_arg, optarg); strcat(temp_arg, "\n"); add_compunit(CU_STRING, temp_arg); break; case 'f': fflag = 1; if (strcmp(optarg, "-") == 0) fflagstdin = 1; add_compunit(CU_FILE, optarg); break; case 'i': inplace = optarg; ispan = 0; /* don't span across input files */ break; case 'l': if(setvbuf(stdout, NULL, _IOLBF, 0) != 0) warnx("setting line buffered output failed"); break; case 'n': nflag = 1; break; case 'u': if(setvbuf(stdout, NULL, _IONBF, 0) != 0) warnx("setting unbuffered output failed"); break; default: case '?': usage(); } argc -= optind; argv += optind; /* First usage case; script is the first arg */ if (!eflag && !fflag && *argv) { add_compunit(CU_STRING, *argv); argv++; } compile(); /* Continue with first and start second usage */ if (*argv) for (; *argv; argv++) add_file(*argv); else if (fflagstdin) exit(rval); else add_file(NULL); process(); cfclose(prog, NULL); if (fclose(stdout)) err(1, "stdout"); exit(rval); } static void usage(void) { (void)fprintf(stderr, "usage: %s script [-Ealnru] [-i extension] [file ...]\n" "\t%s [-Ealnu] [-i extension] [-e script] ... [-f script_file]" " ... [file ...]\n", getprogname(), getprogname()); exit(1); } /* * Like fgets, but go through the chain of compilation units chaining them * together. Empty strings and files are ignored. */ char * cu_fgets(char *buf, int n, int *more) { static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF; static FILE *f; /* Current open file */ static char *s; /* Current pointer inside string */ static char string_ident[30]; char *p; again: switch (state) { case ST_EOF: if (script == NULL) { if (more != NULL) *more = 0; return (NULL); } linenum = 0; switch (script->type) { case CU_FILE: if (strcmp(script->s, "-") == 0) { f = stdin; fname = "stdin"; } else { if ((f = fopen(script->s, "r")) == NULL) err(1, "%s", script->s); fname = script->s; } state = ST_FILE; goto again; case CU_STRING: if (((size_t)snprintf(string_ident, sizeof(string_ident), "\"%s\"", script->s)) >= sizeof(string_ident) - 1) (void)strcpy(string_ident + sizeof(string_ident) - 6, " ...\""); fname = string_ident; s = script->s; state = ST_STRING; goto again; default: __unreachable(); } case ST_FILE: if ((p = fgets(buf, n, f)) != NULL) { linenum++; if (linenum == 1 && buf[0] == '#' && buf[1] == 'n') nflag = 1; if (more != NULL) *more = !feof(f); return (p); } script = script->next; (void)fclose(f); state = ST_EOF; goto again; case ST_STRING: if (linenum == 0 && s[0] == '#' && s[1] == 'n') nflag = 1; p = buf; for (;;) { if (n-- <= 1) { *p = '\0'; linenum++; if (more != NULL) *more = 1; return (buf); } switch (*s) { case '\0': state = ST_EOF; if (s == script->s) { script = script->next; goto again; } else { script = script->next; *p = '\0'; linenum++; if (more != NULL) *more = 0; return (buf); } case '\n': *p++ = '\n'; *p = '\0'; s++; linenum++; if (more != NULL) *more = 0; return (buf); default: *p++ = *s++; } } } /* NOTREACHED */ return (NULL); } /* * Like fgets, but go through the list of files chaining them together. * Set len to the length of the line. */ int mf_fgets(SPACE *sp, enum e_spflag spflag) { struct stat sb; ssize_t len; char *dirbuf, *basebuf; static char *p = NULL; static size_t plen = 0; int c; static int firstfile; if (infile == NULL) { /* stdin? */ if (files->fname == NULL) { if (inplace != NULL) errx(1, "-I or -i may not be used with stdin"); infile = stdin; fname = "stdin"; outfile = stdout; outfname = "stdout"; } firstfile = 1; } for (;;) { if (infile != NULL && (c = getc(infile)) != EOF && !quit) { (void)ungetc(c, infile); break; } /* If we are here then either eof or no files are open yet */ if (infile == stdin) { sp->len = 0; return (0); } if (infile != NULL) { fclose(infile); if (*oldfname != '\0') { /* if there was a backup file, remove it */ unlink(oldfname); /* * Backup the original. Note that hard links * are not supported on all filesystems. */ if ((link(fname, oldfname) != 0) && (rename(fname, oldfname) != 0)) { warn("rename()"); if (*tmpfname) unlink(tmpfname); exit(1); } *oldfname = '\0'; } if (*tmpfname != '\0') { if (outfile != NULL && outfile != stdout) if (fclose(outfile) != 0) { warn("fclose()"); unlink(tmpfname); exit(1); } outfile = NULL; if (rename(tmpfname, fname) != 0) { /* this should not happen really! */ warn("rename()"); unlink(tmpfname); exit(1); } *tmpfname = '\0'; } outfname = NULL; } if (firstfile == 0) files = files->next; else firstfile = 0; if (files == NULL) { sp->len = 0; return (0); } fname = files->fname; if (inplace != NULL) { if (lstat(fname, &sb) != 0) err(1, "%s", fname); if (!S_ISREG(sb.st_mode)) errx(1, "%s: %s %s", fname, "in-place editing only", "works for regular files"); if (*inplace != '\0') { strlcpy(oldfname, fname, sizeof(oldfname)); len = strlcat(oldfname, inplace, sizeof(oldfname)); if (len > (ssize_t)sizeof(oldfname)) errx(1, "%s: name too long", fname); } if ((dirbuf = strdup(fname)) == NULL || (basebuf = strdup(fname)) == NULL) err(1, "strdup"); len = snprintf(tmpfname, sizeof(tmpfname), "%s/.!%ld!%s", dirname(dirbuf), (long)getpid(), basename(basebuf)); free(dirbuf); free(basebuf); if (len >= (ssize_t)sizeof(tmpfname)) errx(1, "%s: name too long", fname); unlink(tmpfname); if (outfile != NULL && outfile != stdout) fclose(outfile); if ((outfile = fopen(tmpfname, "w")) == NULL) err(1, "%s", fname); fchown(fileno(outfile), sb.st_uid, sb.st_gid); fchmod(fileno(outfile), sb.st_mode & ALLPERMS); outfname = tmpfname; if (!ispan) { linenum = 0; resetstate(); } } else { outfile = stdout; outfname = "stdout"; } if ((infile = fopen(fname, "r")) == NULL) { warn("%s", fname); rval = 1; continue; } } /* * We are here only when infile is open and we still have something * to read from it. * * Use getline() so that we can handle essentially infinite input * data. The p and plen are static so each invocation gives * getline() the same buffer which is expanded as needed. */ len = getline(&p, &plen, infile); if (len == -1) err(1, "%s", fname); if (len != 0 && p[len - 1] == '\n') { sp->append_newline = 1; len--; } else if (!lastline()) { sp->append_newline = 1; } else { sp->append_newline = 0; } cspace(sp, p, len, spflag); linenum++; return (1); } /* * Add a compilation unit to the linked list */ static void add_compunit(enum e_cut type, char *s) { struct s_compunit *cu; if ((cu = malloc(sizeof(struct s_compunit))) == NULL) err(1, "malloc"); cu->type = type; cu->s = s; cu->next = NULL; *cu_nextp = cu; cu_nextp = &cu->next; } /* * Add a file to the linked list */ static void add_file(char *s) { struct s_flist *fp; if ((fp = malloc(sizeof(struct s_flist))) == NULL) err(1, "malloc"); fp->next = NULL; *fl_nextp = fp; fp->fname = s; fl_nextp = &fp->next; } static int next_files_have_lines(void) { struct s_flist *file; FILE *file_fd; int ch; file = files; while ((file = file->next) != NULL) { if ((file_fd = fopen(file->fname, "r")) == NULL) continue; if ((ch = getc(file_fd)) != EOF) { /* * This next file has content, therefore current * file doesn't contains the last line. */ ungetc(ch, file_fd); fclose(file_fd); return (1); } fclose(file_fd); } return (0); } int lastline(void) { int ch; if (feof(infile)) { return !( (inplace == NULL || ispan) && next_files_have_lines()); } if ((ch = getc(infile)) == EOF) { return !( (inplace == NULL || ispan) && next_files_have_lines()); } ungetc(ch, infile); return (0); }