diff options
Diffstat (limited to 'usr.bin/sed/main.c')
-rw-r--r-- | usr.bin/sed/main.c | 352 |
1 files changed, 352 insertions, 0 deletions
diff --git a/usr.bin/sed/main.c b/usr.bin/sed/main.c new file mode 100644 index 0000000..14872fd --- /dev/null +++ b/usr.bin/sed/main.c @@ -0,0 +1,352 @@ +/*- + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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. + */ + +#ifndef lint +static char copyright[] = +"@(#) Copyright (c) 1992, 1993\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#ifndef lint +static char sccsid[] = "@(#)main.c 8.2 (Berkeley) 1/3/94"; +#endif /* not lint */ + +#include <sys/types.h> + +#include <ctype.h> +#include <errno.h> +#include <fcntl.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; + +int aflag, eflag, nflag; + +/* + * Current file and line number; line numbers restart across compilation + * units, but span across input files. + */ +char *fname; /* File name. */ +u_long linenum; +int lastline; /* TRUE on the last line of the last file */ + +static void add_compunit __P((enum e_cut, char *)); +static void add_file __P((char *)); + +int +main(argc, argv) + int argc; + char *argv[]; +{ + int c, fflag; + + fflag = 0; + while ((c = getopt(argc, argv, "ae:f:n")) != EOF) + switch (c) { + case 'a': + aflag = 1; + break; + case 'e': + eflag = 1; + add_compunit(CU_STRING, optarg); + break; + case 'f': + fflag = 1; + add_compunit(CU_FILE, optarg); + break; + case 'n': + nflag = 1; + break; + default: + case '?': + (void)fprintf(stderr, +"usage:\tsed script [-an] [file ...]\n\tsed [-an] [-e script] ... [-f scipt_file] ... [file ...]\n"); + exit(1); + } + 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 + add_file(NULL); + process(); + cfclose(prog, NULL); + if (fclose(stdout)) + err(FATAL, "stdout: %s", strerror(errno)); + exit (0); +} + +/* + * Like fgets, but go through the chain of compilation units chaining them + * together. Empty strings and files are ignored. + */ +char * +cu_fgets(buf, n) + char *buf; + int n; +{ + 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) + return (NULL); + linenum = 0; + switch (script->type) { + case CU_FILE: + if ((f = fopen(script->s, "r")) == NULL) + err(FATAL, + "%s: %s", script->s, strerror(errno)); + fname = script->s; + state = ST_FILE; + goto again; + case CU_STRING: + if ((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; + } + case ST_FILE: + if ((p = fgets(buf, n, f)) != NULL) { + linenum++; + if (linenum == 1 && buf[0] == '#' && buf[1] == 'n') + nflag = 1; + 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++; + 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++; + return (buf); + } + case '\n': + *p++ = '\n'; + *p = '\0'; + s++; + linenum++; + return (buf); + default: + *p++ = *s++; + } + } + } + /* NOTREACHED */ +} + +/* + * Like fgets, but go through the list of files chaining them together. + * Set len to the length of the line. + */ +int +mf_fgets(sp, spflag) + SPACE *sp; + enum e_spflag spflag; +{ + static FILE *f; /* Current open file */ + size_t len; + char c, *p; + + if (f == NULL) + /* Advance to first non-empty file */ + for (;;) { + if (files == NULL) { + lastline = 1; + return (0); + } + if (files->fname == NULL) { + f = stdin; + fname = "stdin"; + } else { + fname = files->fname; + if ((f = fopen(fname, "r")) == NULL) + err(FATAL, "%s: %s", + fname, strerror(errno)); + } + if ((c = getc(f)) != EOF) { + (void)ungetc(c, f); + break; + } + (void)fclose(f); + files = files->next; + } + + if (lastline) { + sp->len = 0; + return (0); + } + + /* + * Use fgetln so that we can handle essentially infinite input data. + * Can't use the pointer into the stdio buffer as the process space + * because the ungetc() can cause it to move. + */ + p = fgetln(f, &len); + if (ferror(f)) + err(FATAL, "%s: %s", fname, strerror(errno ? errno : EIO)); + cspace(sp, p, len, spflag); + + linenum++; + /* Advance to next non-empty file */ + while ((c = getc(f)) == EOF) { + (void)fclose(f); + files = files->next; + if (files == NULL) { + lastline = 1; + return (1); + } + if (files->fname == NULL) { + f = stdin; + fname = "stdin"; + } else { + fname = files->fname; + if ((f = fopen(fname, "r")) == NULL) + err(FATAL, "%s: %s", fname, strerror(errno)); + } + } + (void)ungetc(c, f); + return (1); +} + +/* + * Add a compilation unit to the linked list + */ +static void +add_compunit(type, s) + enum e_cut type; + char *s; +{ + struct s_compunit *cu; + + cu = xmalloc(sizeof(struct s_compunit)); + 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(s) + char *s; +{ + struct s_flist *fp; + + fp = xmalloc(sizeof(struct s_flist)); + fp->next = NULL; + *fl_nextp = fp; + fp->fname = s; + fl_nextp = &fp->next; +} |