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sed
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sed.c
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C/C++ Source or Header
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1994-01-31
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/* GNU SED, a batch stream editor.
Copyright (C) 1989, Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <stdio.h>
#include <ctype.h>
#include <regex.h>
/* Compile with 'gcc [-g] [-DHAS_UTILS] [-O] -o sed sed.c [-lutils]' */
/* Use '-DHAS_UTILS', -lutils if you if you have hack's utils library */
/* Add '-I. regex.c' if regex is not in the system include dir/library */
/* This is a good idea */
char *version_string = "GNU sed version 1.06 (or so)";
/*
1.00 Began (thinking about) distributing this file
1.01 Added s/re/rep/[digits]
added #n as first line of script
added filename globbing
added 'l' command
All in the name of POSIX
1.02 Fixed 't', 'b', ':' to trim leading spaces and tabs
Fixed \\ in replacement of 's' command
Added comments
1.03 Fixes from Mike Haertelfor regexps that match the
empty string, and for Ritchie stdio (non-sticky EOF)
1.04 Fixed s/re/rep/[number]
1.05 Fixed error in 'r' (now does things in the right order)
*/
#ifdef USG
#define bcopy(s, d, n) ((void)memcpy((d),(s), (n)))
#endif
/* Struct vector is used to describe a chunk of a sed program. There is one
vector for the main program, and one for each { } pair.
*/
struct vector {
struct sed_cmd *v;
int v_length;
int v_allocated;
struct vector *up_one;
struct vector *next_one;
};
/* Goto structure is used to hold both GOTO's and labels. There are two
separate lists, one of goto's, called 'jumps', and one of labels, called
'labels'.
the V element points to the descriptor for the program-chunk in which the
goto was encountered.
the v_index element counts which element of the vector actually IS the
goto/label. The first element of the vector is zero.
the NAME element is the null-terminated name of the label.
next is the next goto/label in the list
*/
struct sed_label {
struct vector *v;
int v_index;
char *name;
struct sed_label *next;
};
/* ADDR_TYPE is zero for a null address,
one if addr_number is valid, or
two if addr_regex is valid,
three, if the address is '$'
Other values are undefined.
*/
#define ADDR_NULL 0
#define ADDR_NUM 1
#define ADDR_REGEX 2
#define ADDR_LAST 3
struct addr {
int addr_type;
struct re_pattern_buffer *addr_regex;
int addr_number;
};
/* Aflags: If the low order bit is set, a1 has been
matched; apply this command until a2 matches.
If the next bit is set, apply this command to all
lines that DON'T match the address(es).
*/
#define A1_MATCHED_BIT 01
#define ADDR_BANG_BIT 02
struct sed_cmd {
struct addr a1,a2;
int aflags;
char cmd;
union {
/* This structure is used for a, i, and c commands */
struct {
char *text;
int text_len;
} cmd_txt;
/* This is used for b and t commands */
struct sed_cmd *label;
/* This for r and w commands */
FILE *io_file;
/* This for the hairy s command */
/* For the flags var:
low order bit means the 'g' option was given,
next bit means the 'p' option was given,
and the next bit means a 'w' option was given,
and wio_file contains the file to write to. */
#define S_GLOBAL_BIT 01
#define S_PRINT_BIT 02
#define S_WRITE_BIT 04
#define S_NUM_BIT 010
struct {
struct re_pattern_buffer *regx;
char *replacement;
int replace_length;
int flags;
int numb;
FILE *wio_file;
} cmd_regex;
/* This for the y command */
unsigned char *translate;
/* For { and } */
struct vector *sub;
struct sed_label *jump;
} x;
};
/* Sed operates a line at a time. */
struct line {
char *text; /* Pointer to line allocated by malloc. */
int length; /* Length of text. */
int alloc; /* Allocated space for text. */
};
/* This structure holds information about files opend by the 'r', 'w', and 's///w'
commands. In paticular, it holds the FILE pointer to use, the files name,
a flag that is non-zero if the file is being read instead of written. */
#define NUM_FPS 32
struct {
FILE *phile;
char *name;
int readit;
} file_ptrs[NUM_FPS];
/* This for all you losing compilers out there that can't handle void * */
#ifdef __GNU__
#define VOID void
#else
#define VOID char
#endif
extern int optind;
extern char *optarg;
extern int getopt();
extern char *memchr();
extern VOID *memmove();
extern VOID *ck_malloc(),*ck_realloc();
extern VOID *init_buffer();
extern char *get_buffer();
extern FILE *ck_fopen();
extern void ck_fclose();
extern void ck_fwrite();
extern void flush_buffer();
extern void add1_buffer();
extern char *strdup();
struct vector *compile_program();
void savchar();
struct sed_label *setup_jump();
void line_copy();
void line_append();
void append_pattern_space();
void read_file();
void execute_program();
#ifndef HAS_UTILS
char *myname;
#else
extern char *myname;
#endif
/* If set, don't write out the line unless explictly told to */
int no_default_output = 0;
/* Current input line # */
int input_line_number = 0;
/* Are we on the last input file? */
int last_input_file = 0;
/* Have we hit EOF on the last input file? This is used to decide if we
have hit the '$' address yet. */
int input_EOF = 0;
/* non-zero if a quit command has been executed. */
int quit_cmd = 0;
/* Have we done any replacements lately? This is used by the 't' command. */
int replaced = 0;
/* How many '{'s are we executing at the moment */
int program_depth = 0;
/* The complete compiled SED program that we are going to run */
struct vector *the_program = 0;
/* information about labels and jumps-to-labels. This is used to do
the required backpatching after we have compiled all the scripts. */
struct sed_label *jumps = 0;
struct sed_label *labels = 0;
/* The 'current' input line. */
struct line line;
/* An input line that's been stored by later use by the program */
struct line hold;
/* A 'line' to append to the current line when it comes time to write it out */
struct line append;
/* When we're reading a script command from a string, 'prog_start' and 'prog_end' point
to the beginning and end of the string. This would allow us to compile
script strings that contain nulls, except that script strings are only read
from the command line, which is null-terminated */
char *prog_start;
char *prog_end;
/* When we're reading a script command from a string, 'prog_cur' points
to the current character in the string */
char *prog_cur;
/* This is the name of the current script file. It is used for error messages. */
char *prog_name;
/* This is the current script file. If it is zero, we are reading from a string
stored in 'prog_start' instead. If both 'prog_file' and 'prog_start' are
zero, we're in trouble! */
FILE *prog_file;
/* this is the number of the current script line that we're compiling. It is
used to give out useful and informative error messages. */
int prog_line = 1;
/* This is the file pointer that we're currently reading data from. It may
be stdin */
FILE *input_file;
/* If this variable is non-zero at exit, one or more of the input files couldn't
be opend. */
int bad_input = 0;
/* 'an empty regular expression is equivelent to the last regular expression read'
so we have to keep track of the last regex used. Here's where we store a
pointer to it (it is only malloc()'d once) */
struct re_pattern_buffer *last_regex;
/* Various error messages we may want to print */
static char ONE_ADDR[] = "Command only uses one address";
static char NO_ADDR[] = "Command doesn't take any addresses";
static char LINE_JUNK[] ="Extra characters after command";
static char BAD_EOF[] = "Unexpected End-of-file";
static char USAGE[] = "Usage: %s [-n] [-e script...] [-f sfile...] [file...]";
static char NO_REGEX[] = "No previous regular expression";
/* Yes, the main program, which parses arguments, and does the right thing with them,
It also inits the temporary storage, etc. */
main(argc,argv)
char **argv;
{
int opt;
int compiled = 0;
struct sed_label *go,*lbl;
myname=argv[0];
if ( argc == 1 )
usage();
while((opt=getopt(argc,argv,"ne:f:"))!=EOF) {
switch(opt) {
case 'n':
if(no_default_output)
usage();
no_default_output++;
break;
case 'e':
compile_string(optarg);
compiled++;
break;
case 'f':
compile_file(optarg);
compiled++;
break;
}
}
if(!compiled) {
if(argc<=optind)
panic("No program to run");
compile_string(argv[optind]);
optind++;
}
for(go=jumps;go;go=go->next) {
for(lbl=labels;lbl;lbl=lbl->next)
if(!strcmp(lbl->name,go->name))
break;
if(!lbl)
panic("Can't find label for jump to '%s'",go->name);
go->v->v[go->v_index].x.jump=lbl;
}
line.length=0;
line.alloc=50;
line.text=ck_malloc(50);
append.length=0;
append.alloc=50;
append.text=ck_malloc(50);
hold.length=0;
hold.alloc=50;
hold.text=ck_malloc(50);
if(argc<=optind) {
last_input_file++;
read_file("-");
} else while(optind<argc) {
if(optind==argc-1)
last_input_file++;
read_file(argv[optind]);
optind++;
if(quit_cmd)
break;
}
if(bad_input)
exit(2);
exit(0);
}
/* 'str' is a string (from the command line) that contains a sed command.
Compile the command, and add it to the end of 'the_program' */
compile_string(str)
char *str;
{
prog_file = 0;
prog_line=0;
prog_start=prog_cur=str;
prog_end=str+strlen(str);
the_program=compile_program(the_program);
}
/* 'str' is the name of a file containing sed commands. Read them in
and add them to the end of 'the_program' */
compile_file(str)
char *str;
{
FILE *file;
int ch;
prog_start=prog_cur=prog_end=0;
prog_name=str;
prog_line=1;
if(str[0]=='-' && str[1]=='\0')
prog_file=stdin;
else
#ifdef OS2
{
char fname[256];
_searchenv(str, "INIT", fname);
if ( fname[0] == 0 )
_searchenv(str, "PATH", fname);
if ( fname[0] == 0 )
strcpy(fname,str);
prog_file=ck_fopen(fname,"r");
}
#else
prog_file=ck_fopen(str,"r");
#endif
#ifdef OS2
if ( !isatty(fileno(prog_file)) )
{
char line[80];
fgets(line, sizeof(line), prog_file);
if ( strnicmp(line, "extproc ", 8) != 0 )
rewind(prog_file);
}
#endif
ch=getc(prog_file);
if(ch=='#') {
ch=getc(prog_file);
if(ch=='n')
no_default_output++;
while(ch!=EOF && ch!='\n')
ch=getc(prog_file);
} else if(ch!=EOF)
ungetc(ch,prog_file);
the_program=compile_program(the_program);
}
#define MORE_CMDS 40
/* Read a program (or a subprogram within '{' '}' pairs) in and store
the compiled form in *'vector' Return a pointer to the new vector. */
struct vector *
compile_program(vector)
struct vector *vector;
{
struct sed_cmd *cur_cmd;
int ch;
int slash;
VOID *b;
unsigned char *string;
int num;
FILE *compile_filename();
if(!vector) {
vector=(struct vector *)ck_malloc(sizeof(struct vector));
vector->v=(struct sed_cmd *)ck_malloc(MORE_CMDS*sizeof(struct sed_cmd));
vector->v_allocated=MORE_CMDS;
vector->v_length=0;
vector->up_one = 0;
vector->next_one = 0;
}
for(;;) {
do ch=inchar();
while(ch!=EOF && (isspace(ch) || ch=='\n' || ch==';'));
if(ch==EOF)
break;
savchar(ch);
if(vector->v_length==vector->v_allocated) {
vector->v=(struct sed_cmd *)ck_realloc((VOID *)vector->v,(vector->v_length+MORE_CMDS)*sizeof(struct sed_cmd));
vector->v_allocated+=MORE_CMDS;
}
cur_cmd=vector->v+vector->v_length;
vector->v_length++;
cur_cmd->a1.addr_type=0;
cur_cmd->a2.addr_type=0;
cur_cmd->aflags=0;
cur_cmd->cmd=0;
skip_comment:
if(compile_address(&(cur_cmd->a1))) {
ch=inchar();
if(ch==',') {
do ch=inchar();
while(ch!=EOF && isspace(ch));
savchar(ch);
if(compile_address(&(cur_cmd->a2)))
;
else
bad_prog("Unexpected ','");
} else
savchar(ch);
}
ch=inchar();
if(ch==EOF)
break;
new_cmd:
switch(ch) {
case '#':
if(cur_cmd->a1.addr_type!=0)
bad_prog(NO_ADDR);
do ch=inchar();
while(ch!=EOF && ch!='\n');
goto skip_comment;
case '!':
if(cur_cmd->aflags & ADDR_BANG_BIT)
bad_prog("Multiple '!'s");
cur_cmd->aflags|= ADDR_BANG_BIT;
do ch=inchar();
while(ch!=EOF && isspace(ch));
if(ch==EOF)
bad_prog(BAD_EOF);
/* savchar(ch); */
goto new_cmd;
case 'a':
case 'i':
if(cur_cmd->a2.addr_type!=0)
bad_prog(ONE_ADDR);
/* Fall Through */
case 'c':
cur_cmd->cmd=ch;
if(inchar()!='\\' || inchar()!='\n')
bad_prog(LINE_JUNK);
b=init_buffer();
while((ch=inchar())!=EOF && ch!='\n') {
if(ch=='\\')
ch=inchar();
add1_buffer(b,ch);
}
if(ch!=EOF)
add1_buffer(b,ch);
num=size_buffer(b);
string=(unsigned char *)ck_malloc(num);
bcopy(get_buffer(b),string,num);
flush_buffer(b);
cur_cmd->x.cmd_txt.text_len=num;
cur_cmd->x.cmd_txt.text=(char *)string;
break;
case '{':
cur_cmd->cmd=ch;
program_depth++;
/* while((ch=inchar())!=EOF && ch!='\n')
if(!isspace(ch))
bad_prog(LINE_JUNK); */
cur_cmd->x.sub=compile_program((struct vector *)0);
/* FOO JF is this the right thing to do? */
break;
case '}':
if(!program_depth)
bad_prog("Unexpected '}'");
--(vector->v_length);
while((ch=inchar())!=EOF && ch!='\n' && ch!=';')
if(!isspace(ch))
bad_prog(LINE_JUNK);
return vector;
case ':':
cur_cmd->cmd=ch;
if(cur_cmd->a1.addr_type!=0)
bad_prog(": doesn't want any addresses");
labels=setup_jump(labels,cur_cmd,vector);
break;
case 'b':
case 't':
cur_cmd->cmd=ch;
jumps=setup_jump(jumps,cur_cmd,vector);
break;
case 'q':
case '=':
if(cur_cmd->a2.addr_type)
bad_prog(ONE_ADDR);
/* Fall Through */
case 'd':
case 'D':
case 'g':
case 'G':
case 'h':
case 'H':
case 'l':
case 'n':
case 'N':
case 'p':
case 'P':
case 'x':
cur_cmd->cmd=ch;
do ch=inchar();
while(ch!=EOF && isspace(ch) && ch!='\n' && ch!=';');
if(ch!='\n' && ch!=';' && ch!=EOF)
bad_prog(LINE_JUNK);
break;
case 'r':
if(cur_cmd->a2.addr_type!=0)
bad_prog(ONE_ADDR);
/* FALL THROUGH */
case 'w':
cur_cmd->cmd=ch;
cur_cmd->x.io_file=compile_filename(ch=='r');
break;
case 's':
cur_cmd->cmd=ch;
b=init_buffer();
slash=inchar();
while((ch=inchar())!=EOF && ch!=slash) {
if(ch!='\\') {
add1_buffer(b,ch);
continue;
}
ch=inchar();
switch(ch) {
case 'n':
add1_buffer(b,'\n');
break;
/* case 'b':
add1_buffer(b,'\b');
break;
case 'f':
add1_buffer(b,'\f');
break;
case 'r':
add1_buffer(b,'\r');
break;
case 't':
add1_buffer(b,'\t');
break; */
case EOF:
break;
default:
add1_buffer(b,'\\');
add1_buffer(b,ch);
break;
}
}
if(ch==EOF)
bad_prog(BAD_EOF);
if(size_buffer(b)) {
last_regex=(struct re_pattern_buffer *)ck_malloc(sizeof(struct re_pattern_buffer));
last_regex->allocated=size_buffer(b);
last_regex->buffer=ck_malloc(last_regex->allocated);
last_regex->fastmap=0;
last_regex->translate=0;
re_compile_pattern(get_buffer(b),size_buffer(b),last_regex);
} else if(!last_regex)
bad_prog(NO_REGEX);
cur_cmd->x.cmd_regex.regx=last_regex;
flush_buffer(b);
b=init_buffer();
while((ch=inchar())!=EOF && ch!=slash) {
if(ch=='\\') {
int ci;
ci=inchar();
if(ci!=EOF) {
if(ci!='\n')
add1_buffer(b,ch);
add1_buffer(b,ci);
}
} else
add1_buffer(b,ch);
}
cur_cmd->x.cmd_regex.replace_length=size_buffer(b);
cur_cmd->x.cmd_regex.replacement=ck_malloc(cur_cmd->x.cmd_regex.replace_length);
bcopy(get_buffer(b),cur_cmd->x.cmd_regex.replacement,cur_cmd->x.cmd_regex.replace_length);
flush_buffer(b);
cur_cmd->x.cmd_regex.flags=0;
cur_cmd->x.cmd_regex.numb=0;
if(ch==EOF)
break;
do {
ch=inchar();
switch(ch) {
case 'p':
if(cur_cmd->x.cmd_regex.flags&S_PRINT_BIT)
bad_prog("multiple 'p' options to 's' command");
cur_cmd->x.cmd_regex.flags|=S_PRINT_BIT;
break;
case 'g':
if(cur_cmd->x.cmd_regex.flags&S_NUM_BIT)
cur_cmd->x.cmd_regex.flags&= ~S_NUM_BIT;
if(cur_cmd->x.cmd_regex.flags&S_GLOBAL_BIT)
bad_prog("multiple 'g' options to 's' command");
cur_cmd->x.cmd_regex.flags|=S_GLOBAL_BIT;
break;
case 'w':
cur_cmd->x.cmd_regex.flags|=S_WRITE_BIT;
cur_cmd->x.cmd_regex.wio_file=compile_filename(0);
ch='\n';
break;
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
case '8': case '9':
if(cur_cmd->x.cmd_regex.flags&S_NUM_BIT)
bad_prog("multiple number options to 's' command");
if((cur_cmd->x.cmd_regex.flags&S_GLOBAL_BIT)==0)
cur_cmd->x.cmd_regex.flags|=S_NUM_BIT;
num = 0;
while(isdigit(ch)) {
num=num*10+ch-'0';
ch=inchar();
}
savchar(ch);
cur_cmd->x.cmd_regex.numb=num;
break;
case '\n':
case ';':
case EOF:
break;
default:
bad_prog("Unknown option to 's'");
break;
}
} while(ch!=EOF && ch!='\n' && ch!=';');
if(ch==EOF)
break;
break;
case 'y':
cur_cmd->cmd=ch;
string=(unsigned char *)ck_malloc(256);
for(num=0;num<256;num++)
string[num]=num;
b=init_buffer();
slash=inchar();
while((ch=inchar())!=EOF && ch!=slash)
add1_buffer(b,ch);
cur_cmd->x.translate=string;
string=(unsigned char *)get_buffer(b);
for(num=size_buffer(b);num;--num) {
ch=inchar();
if(ch==EOF)
bad_prog(BAD_EOF);
if(ch==slash)
bad_prog("strings for y command are different lengths");
cur_cmd->x.translate[*string++]=ch;
}
flush_buffer(b);
if(inchar()!=slash || ((ch=inchar())!=EOF && ch!='\n' && ch!=';'))
bad_prog(LINE_JUNK);
break;
default:
bad_prog("Unknown command");
}
}
return vector;
}
/* Complain about a programming error and exit. */
bad_prog(why)
char *why;
{
if(prog_line)
fprintf(stderr,"\n%s: file %s line %d: %s\n",myname,prog_name,prog_line,why);
else
fprintf(stderr,"\n%s: %s\n",myname,why);
exit(1);
}
/* Read the next character from the program. Return EOF if there isn't
anything to read. Keep prog_line up to date, so error messages can
be meaningful. */
int
inchar()
{
int ch;
if(prog_file) {
if(feof(prog_file))
return EOF;
else
ch=getc(prog_file);
} else {
if(!prog_cur)
return EOF;
else if(prog_cur==prog_end) {
ch=EOF;
prog_cur=0;
} else
ch= *prog_cur++;
}
if(ch=='\n' && prog_line)
prog_line++;
return ch;
}
/* unget 'ch' so the next call to inchar will return it. 'ch' must not be
EOF or anything nasty like that. */
void
savchar(ch)
int ch;
{
if(ch==EOF)
return;
if(ch=='\n' && prog_line>1)
--prog_line;
if(prog_file)
ungetc(ch,prog_file);
else
*--prog_cur=ch;
}
/* Try to read an address for a sed command. If it succeeeds,
return non-zero and store the resulting address in *'addr'.
If the input doesn't look like an address read nothing
and return zero. */
int
compile_address(addr)
struct addr *addr;
{
int ch;
int num;
char *b,*init_buffer();
ch=inchar();
if(isdigit(ch)) {
num=ch-'0';
while((ch=inchar())!=EOF && isdigit(ch))
num=num*10+ch-'0';
while(ch!=EOF && isspace(ch))
ch=inchar();
savchar(ch);
addr->addr_type=ADDR_NUM;
addr->addr_number = num;
return 1;
} else if(ch=='/') {
addr->addr_type=ADDR_REGEX;
b=init_buffer();
while((ch=inchar())!=EOF && ch!='/') {
add1_buffer(b,ch);
if(ch=='\\') {
ch=inchar();
if(ch!=EOF)
add1_buffer(b,ch);
}
}
if(size_buffer(b)) {
last_regex=(struct re_pattern_buffer *)ck_malloc(sizeof(struct re_pattern_buffer));
last_regex->allocated=size_buffer(b);
last_regex->buffer=ck_malloc(last_regex->allocated);
last_regex->fastmap=0;
last_regex->translate=0;
re_compile_pattern(get_buffer(b),size_buffer(b),last_regex);
} else if(!last_regex)
bad_prog(NO_REGEX);
addr->addr_regex=last_regex;
flush_buffer(b);
do ch=inchar();
while(ch!=EOF && isspace(ch));
savchar(ch);
return 1;
} else if(ch=='$') {
addr->addr_type=ADDR_LAST;
do ch=inchar();
while(ch!=EOF && isspace(ch));
savchar(ch);
return 1;
} else
savchar(ch);
return 0;
}
/* Store a label (or label reference) created by a ':', 'b', or 't'
comand so that the jump to/from the lable can be backpatched after
compilation is complete */
struct sed_label *
setup_jump(list,cmd,vec)
struct sed_label *list;
struct sed_cmd *cmd;
struct vector *vec;
{
struct sed_label *tmp;
VOID *b;
int ch;
b=init_buffer();
while((ch=inchar())==' ' || ch=='\t')
;
do add1_buffer(b,ch);
while((ch=inchar())!=EOF && ch!='\n');
add1_buffer(b,'\0');
tmp=(struct sed_label *)ck_malloc(sizeof(struct sed_label));
tmp->v=vec;
tmp->v_index=cmd-vec->v;
tmp->name=strdup(get_buffer(b));
tmp->next=list;
flush_buffer(b);
return tmp;
}
/* read in a filename for a 'r', 'w', or 's///w' command, and
update the internal structure about files. The file is
opened if it isn't already open. */
FILE *
compile_filename(readit)
{
char *file_name;
int n;
VOID *b;
int ch;
char **globbed;
extern char **glob_filename();
if(inchar()!=' ')
bad_prog("missing ' ' before filename");
b=init_buffer();
while((ch=inchar())!=EOF && ch!='\n')
add1_buffer(b,ch);
add1_buffer(b,'\0');
file_name=get_buffer(b);
globbed=glob_filename(file_name);
if(globbed==0 || globbed==(char **)-1)
bad_prog("can't parse filename");
if(globbed[0] && globbed[1]!=0)
bad_prog("multiple files");
if(globbed[0])
file_name=globbed[0];
for(n=0;n<NUM_FPS;n++) {
if(!file_ptrs[n].name)
break;
if(!strcmp(file_ptrs[n].name,file_name)) {
if(file_ptrs[n].readit!=readit)
bad_prog("Can't open file for both reading and writing");
flush_buffer(b);
return file_ptrs[n].phile;
}
}
if(n<NUM_FPS) {
file_ptrs[n].name=strdup(file_name);
file_ptrs[n].readit=readit;
file_ptrs[n].phile=ck_fopen(file_name,readit ? "r" : "a");
flush_buffer(b);
return file_ptrs[n].phile;
} else {
bad_prog("Hopelessely evil compiled in limit on number of open files. re-compile sed\n");
return 0;
}
}
/* Parse a filename given by a 'r' 'w' or 's///w' command. */
void
read_file(name)
char *name;
{
if(*name=='-' && name[1]=='\0')
input_file=stdin;
else {
input_file=fopen(name,"r");
if(input_file==0) {
extern int errno;
extern char *sys_errlist[];
extern int sys_nerr;
char *ptr;
ptr=(errno>=0 && errno<sys_nerr) ? sys_errlist[errno] : "Unknown error code";
bad_input++;
fprintf(stderr,"\n%s: can't read %s: %s\n",myname,name,ptr);
return;
}
}
while(read_pattern_space()) {
execute_program(the_program);
if(!no_default_output)
ck_fwrite(line.text,1,line.length,stdout);
if(append.length) {
ck_fwrite(append.text,1,append.length,stdout);
append.length=0;
}
if(quit_cmd)
break;
}
ck_fclose(input_file);
}
/* Execute the program 'vec' on the current input line. */
void
execute_program(vec)
struct vector *vec;
{
struct sed_cmd *cur_cmd;
int n;
int addr_matched;
static int end_cycle;
int start;
int remain;
int offset;
static struct line tmp;
struct line t;
char *rep,*rep_end,*rep_next,*rep_cur;
struct re_registers regs;
int count = 0;
void str_append();
end_cycle = 0;
for(cur_cmd=vec->v,n=vec->v_length;n;cur_cmd++,n--) {
exe_loop:
addr_matched=0;
if(cur_cmd->aflags&A1_MATCHED_BIT) {
addr_matched=1;
if(match_address(&(cur_cmd->a2)))
cur_cmd->aflags&=~A1_MATCHED_BIT;
} else if(match_address(&(cur_cmd->a1))) {
addr_matched=1;
if(cur_cmd->a2.addr_type!=ADDR_NULL)
cur_cmd->aflags|=A1_MATCHED_BIT;
}
if(cur_cmd->aflags&ADDR_BANG_BIT)
addr_matched= !addr_matched;
if(!addr_matched)
continue;
switch(cur_cmd->cmd) {
case '{': /* Execute sub-program */
execute_program(cur_cmd->x.sub);
break;
case ':': /* Executing labels is easy. */
break;
case '=':
printf("%d\n",input_line_number);
break;
case 'a':
if(append.alloc-append.length<cur_cmd->x.cmd_txt.text_len) {
append.text=ck_realloc(append.text,append.alloc+cur_cmd->x.cmd_txt.text_len);
append.alloc+=cur_cmd->x.cmd_txt.text_len;
}
bcopy(cur_cmd->x.cmd_txt.text,append.text+append.length,cur_cmd->x.cmd_txt.text_len);
append.length+=cur_cmd->x.cmd_txt.text_len;
break;
case 'b':
if(!cur_cmd->x.jump)
end_cycle++;
else {
struct sed_label *j = cur_cmd->x.jump;
n= j->v->v_length - j->v_index;
cur_cmd= j->v->v + j->v_index;
goto exe_loop;
}
break;
case 'c':
line.length=0;
if(!(cur_cmd->aflags&A1_MATCHED_BIT))
ck_fwrite(cur_cmd->x.cmd_txt.text,1,cur_cmd->x.cmd_txt.text_len,stdout);
end_cycle++;
break;
case 'd':
line.length=0;
end_cycle++;
break;
case 'D':
{
char *tmp;
int newlength;
tmp=memchr(line.text,'\n',line.length);
newlength=line.length-(tmp-line.text);
if(newlength)
memmove(line.text,tmp,newlength);
line.length=newlength;
}
end_cycle++;
break;
case 'g':
line_copy(&hold,&line);
break;
case 'G':
line_append(&hold,&line);
break;
case 'h':
line_copy(&line,&hold);
break;
case 'H':
line_append(&line,&hold);
break;
case 'i':
ck_fwrite(cur_cmd->x.cmd_txt.text,1,cur_cmd->x.cmd_txt.text_len,stdout);
break;
case 'l':
{
char *tmp;
int n;
int width = 0;
n=line.length;
tmp=line.text;
/* Use --n so this'll skip the trailing newline */
while(--n) {
if(width>77) {
width=0;
putchar('\n');
}
if(isprint(*tmp)) {
putchar(*tmp);
width++;
} else switch(*tmp) {
case '\0':
printf("\\0");
width+=2;
break;
case '\a':
printf("\\a");
width+=2;
break;
case '\b':
printf("\\b");
width+=2;
break;
case '\f':
printf("\\f");
width+=2;
break;
case '\n':
printf("\\n");
width+=2;
break;
case '\r':
printf("\\r");
width+=2;
break;
case '\t':
printf("\\t");
width+=2;
break;
case '\v':
printf("\\v");
width+=2;
break;
default:
printf("\\x%02x",(*tmp)&0xFF);
width+=2;
break;
}
tmp++;
}
putchar('\n');
}
break;
case 'n':
ck_fwrite(line.text,1,line.length,stdout);
read_pattern_space();
break;
case 'N':
append_pattern_space();
break;
case 'p':
ck_fwrite(line.text,1,line.length,stdout);
break;
case 'P':
{
char *tmp;
tmp=memchr(line.text,'\n',line.length);
ck_fwrite(line.text,1,line.length-(tmp-line.text),stdout);
}
break;
case 'q':
quit_cmd++;
end_cycle++;
break;
case 'r':
{
int n;
char tmp_buf[1024];
rewind(cur_cmd->x.io_file);
while((n=fread(append.text+append.length,sizeof(char),append.alloc-append.length,cur_cmd->x.io_file))>0) {
append.length += n;
if(append.length==append.alloc) {
append.text = ck_realloc(append.text, append.alloc + cur_cmd->x.cmd_txt.text_len);
append.alloc += cur_cmd->x.cmd_txt.text_len;
}
}
if(ferror(cur_cmd->x.io_file))
panic("Read error on input file to 'r' command");
}
break;
case 's':
if(!tmp.alloc) {
tmp.alloc=50;
tmp.text=ck_malloc(50);
}
count=0;
start = 0;
remain=line.length-1;
tmp.length=0;
rep = cur_cmd->x.cmd_regex.replacement;
rep_end=rep+cur_cmd->x.cmd_regex.replace_length;
while((offset = re_search(cur_cmd->x.cmd_regex.regx,
line.text,
line.length-1,
start,
remain,
®s))>=0) {
count++;
if(offset-start)
str_append(&tmp,line.text+start,offset-start);
if(cur_cmd->x.cmd_regex.flags&S_NUM_BIT) {
if(count!=cur_cmd->x.cmd_regex.numb) {
str_append(&tmp,line.text+regs.start[0],regs.end[0]-regs.start[0]);
start = (offset == regs.end[0] ? offset + 1 : regs.end[0]);
remain = (line.length-1) - start;
continue;
}
}
for(rep_next=rep_cur=rep;rep_next<rep_end;rep_next++) {
if(*rep_next=='&') {
if(rep_next-rep_cur)
str_append(&tmp,rep_cur,rep_next-rep_cur);
str_append(&tmp,line.text+regs.start[0],regs.end[0]-regs.start[0]);
rep_cur=rep_next+1;
} else if(*rep_next=='\\') {
if(rep_next-rep_cur)
str_append(&tmp,rep_cur,rep_next-rep_cur);
rep_next++;
if(rep_next!=rep_end) {
int n;
if(*rep_next>='0' && *rep_next<='9') {
n= *rep_next -'0';
str_append(&tmp,line.text+regs.start[n],regs.end[n]-regs.start[n]);
} else
str_append(&tmp,rep_next,1);
}
rep_cur=rep_next+1;
}
}
if(rep_next-rep_cur)
str_append(&tmp,rep_cur,rep_next-rep_cur);
if (offset == regs.end[0]) {
str_append(&tmp, line.text + offset, 1);
++regs.end[0];
}
start = regs.end[0];
remain = (line.length-1) - start;
if(remain<0)
break;
if(!(cur_cmd->x.cmd_regex.flags&S_GLOBAL_BIT))
break;
}
if(!count)
break;
replaced=1;
str_append(&tmp,line.text+regs.end[0],line.length-regs.end[0]);
t.text=line.text;
t.length=line.length;
t.alloc=line.alloc;
line.text=tmp.text;
line.length=tmp.length;
line.alloc=tmp.alloc;
tmp.text=t.text;
tmp.length=t.length;
tmp.alloc=t.alloc;
if(cur_cmd->x.cmd_regex.flags&S_WRITE_BIT)
ck_fwrite(line.text,1,line.length,cur_cmd->x.cmd_regex.wio_file);
if(cur_cmd->x.cmd_regex.flags&S_PRINT_BIT)
ck_fwrite(line.text,1,line.length,stdout);
break;
case 't':
if(replaced) {
replaced = 0;
if(!cur_cmd->x.jump)
end_cycle++;
else {
struct sed_label *j = cur_cmd->x.jump;
n= j->v->v_length - j->v_index;
cur_cmd= j->v->v + j->v_index;
goto exe_loop;
}
}
break;
case 'w':
ck_fwrite(line.text,1,line.length,cur_cmd->x.io_file);
break;
case 'x':
{
struct line tmp;
tmp=line;
line=hold;
hold=tmp;
}
break;
case 'y':
{
unsigned char *p,*e;
for(p=(unsigned char *)(line.text),e=p+line.length;p<e;p++)
*p=cur_cmd->x.translate[*p];
}
break;
default:
panic("INTERNAL ERROR: Bad cmd %c",cur_cmd->cmd);
}
if(end_cycle)
break;
}
}
/* Return non-zero if the current line matches the address
pointed to by 'addr'. */
match_address(addr)
struct addr *addr;
{
switch(addr->addr_type) {
case ADDR_NULL:
return 1;
case ADDR_NUM:
return (input_line_number==addr->addr_number);
case ADDR_REGEX:
return (re_search(addr->addr_regex,
line.text,
line.length-1,
0,
line.length-1,
0)>=0) ? 1 : 0;
case ADDR_LAST:
return (input_EOF) ? 1 : 0;
default:
panic("INTERNAL ERROR: bad address type");
break;
}
return -1;
}
/* Read in the next line of input, and store it in the
pattern space. Return non-zero if this is the last line of input */
int
read_pattern_space()
{
int n;
char *p;
int ch;
p=line.text;
n=line.alloc;
if(feof(input_file))
return 0;
input_line_number++;
replaced=0;
for(;;) {
ch=getc(input_file);
if(ch==EOF) {
if(n==line.alloc)
return 0;
*p++='\n';
--n;
line.length=line.alloc-n;
if(last_input_file)
input_EOF++;
return 1;
}
*p++=ch;
--n;
if(ch=='\n') {
line.length=line.alloc-n;
break;
}
if(n==0) {
line.text=ck_realloc(line.text,line.alloc*2);
p=line.text+line.alloc;
n=line.alloc;
line.alloc*=2;
}
}
ch=getc(input_file);
if(ch!=EOF)
ungetc(ch,input_file);
else if(last_input_file)
input_EOF++;
return 1;
}
/* Inplement the 'N' command, which appends the next line of input to
the pattern space. */
void
append_pattern_space()
{
char *p;
int n;
int ch;
p=line.text+line.length;
n=line.alloc-line.length;
input_line_number++;
replaced=0;
if(feof(input_file))
return;
for(;;) {
ch=getc(input_file);
if(ch==EOF) {
if(n==line.alloc)
return;
*p++='\n';
--n;
line.length=line.alloc-n;
if(last_input_file)
input_EOF++;
return;
}
*p++=ch;
--n;
if(ch=='\n') {
line.length=line.alloc-n;
break;
}
if(n==0) {
line.text=ck_realloc(line.text,line.alloc*2);
p=line.text+line.alloc;
n=line.alloc;
line.alloc*=2;
}
}
ch=getc(input_file);
if(ch!=EOF)
ungetc(ch,input_file);
else if(last_input_file)
input_EOF++;
}
/* Copy the contents of the line 'from' into the line 'to'.
This destroys the old contents of 'to'. It will still work
if the line 'from' contains nulls. */
void
line_copy(from,to)
struct line *from,*to;
{
if(from->length>to->alloc) {
to->alloc=from->length;
to->text=ck_realloc(to->text,to->alloc);
}
bcopy(from->text,to->text,from->length);
to->length=from->length;
}
/* Append the contents of the line 'from' to the line 'to'.
This routine will work even if the line 'from' contains nulls */
void
line_append(from,to)
struct line *from,*to;
{
if(from->length>(to->alloc-to->length)) {
to->alloc+=from->length;
to->text=ck_realloc(to->text,to->alloc);
}
bcopy(from->text,to->text+to->length,from->length);
to->length+=from->length;
}
/* Append 'length' bytes from 'string' to the line 'to'
This routine *will* append bytes with nulls in them, without
failing. */
void
str_append(to,string,length)
struct line *to;
char *string;
int length;
{
if(length>to->alloc-to->length) {
to->alloc+=length;
to->text=ck_realloc(to->text,to->alloc);
}
bcopy(string,to->text+to->length,length);
to->length+=length;
}
#ifndef HAS_UTILS
/* These routines were written as part of a library (by me), but since most
people don't have the library, here they are. */
usage()
{
printf("\n%s\n\n", version_string);
printf(USAGE,myname);
printf("\n\n -n no default output"
"\n -e script read script as a sed command"
"\n -f file read sed commands contained in file\n");
exit(4);
}
#ifdef __STDC__
#include "stdarg.h"
/* Print an error message and exit */
panic(str)
char *str;
{
va_list iggy;
va_start(iggy,str);
fprintf(stderr,"\n%s: ",myname);
#ifdef NO_VFPRINTF
_doprnt(str,&iggy,stderr);
#else
vfprintf(stderr,str,iggy);
#endif
putc('\n',stderr);
va_end(iggy);
exit(4);
}
#else
#include "varargs.h"
panic(str,va_alist)
char *str;
va_dcl
{
va_list iggy;
va_start(iggy);
fprintf(stderr,"\n%s: ",myname);
#ifdef NO_VFPRINTF
_doprnt(str,&iggy,stderr);
#else
vfprintf(stderr,str,iggy);
#endif
putc('\n',stderr);
va_end(iggy);
exit(4);
}
#endif
/* Store information about files opened with ck_fopen
so that error messages from ck_fread, etc can print the
name of the file that had the error */
#define N_FILE 32
struct id {
FILE *fp;
char *name;
};
static struct id __id_s[N_FILE];
/* Internal routine to get a filename from __id_s */
char *
__fp_name(fp)
FILE *fp;
{
int n;
for(n=0;n<N_FILE;n++) {
if(__id_s[n].fp==fp)
return __id_s[n].name;
}
return "{Unknown file pointer}";
}
/* Panic on failing fopen */
FILE *
ck_fopen(name,mode)
char *name;
char *mode;
{
FILE *ret;
int n;
ret=fopen(name,mode);
if(ret==(FILE *)0)
panic("Couldn't open file %s",name);
for(n=0;n<N_FILE;n++) {
if(ret==__id_s[n].fp) {
free((VOID *)__id_s[n].name);
__id_s[n].name=(char *)ck_malloc(strlen(name)+1);
strcpy(__id_s[n].name,name);
break;
}
}
if(n==N_FILE) {
for(n=0;n<N_FILE;n++)
if(__id_s[n].fp==(FILE *)0)
break;
if(n==N_FILE)
panic("Internal error: too many files open");
__id_s[n].fp=ret;
__id_s[n].name=(char *)ck_malloc(strlen(name)+1);
strcpy(__id_s[n].name,name);
}
return ret;
}
/* Panic on failing fwrite */
void
ck_fwrite(ptr,size,nmemb,stream)
char *ptr;
int size,nmemb;
FILE *stream;
{
if(fwrite(ptr,size,nmemb,stream)!=nmemb)
panic("couldn't write %d items to %s",nmemb,__fp_name(stream));
}
/* Panic on failing fclose */
void
ck_fclose(stream)
FILE *stream;
{
if(fclose(stream)==EOF)
panic("Couldn't close %s",__fp_name(stream));
}
/* Panic on failing malloc */
VOID *
ck_malloc(size)
int size;
{
VOID *ret;
VOID *malloc();
ret=malloc(size);
if(ret==(VOID *)0)
panic("Couldn't allocate memory");
return ret;
}
/* Panic on failing realloc */
VOID *
ck_realloc(ptr,size)
VOID *ptr;
int size;
{
VOID *ret;
VOID *realloc();
ret=realloc(ptr,size);
if(ret==(VOID *)0)
panic("Couldn't re-allocate memory");
return ret;
}
/* Return a malloc()'d copy of a string */
char *
strdup(str)
char *str;
{
char *ret;
ret=(char *)ck_malloc(strlen(str)+2);
strcpy(ret,str);
return ret;
}
/*
* memchr - search for a byte
*
*/
VOID *
memchr(s, ucharwanted, size)
VOID *s;
int ucharwanted;
int size;
{
register char *scan;
register n;
register uc;
scan = (char *)s;
uc = (ucharwanted&0xFF);
for (n = size; n > 0; n--)
if ((*scan)&0xFF == uc)
return((VOID *)scan);
else
scan++;
return 0;
}
/*
* memmove - copy bytes, being careful about overlap.
*/
VOID *
memmove(dst, src, size)
VOID *dst;
VOID *src;
int size;
{
register char *d;
register char *s;
register int n;
if (size <= 0)
return(dst);
s = (char *)src;
d = (char *)dst;
if (s <= d && s + (size-1) >= d) {
/* Overlap, must copy right-to-left. */
s += size-1;
d += size-1;
for (n = size; n > 0; n--)
*d-- = *s--;
} else
for (n = size; n > 0; n--)
*d++ = *s++;
return(dst);
}
/* Implement a variable sized buffer of 'stuff'. We don't know what it is,
nor do we care, as long as it doesn't mind being aligned by malloc. */
struct buffer {
int allocated;
int length;
char *b;
};
#define MIN_ALLOCATE 50
VOID *
init_buffer()
{
struct buffer *b;
b=(struct buffer *)ck_malloc(sizeof(struct buffer));
b->allocated=MIN_ALLOCATE;
b->b=(char *)ck_malloc(MIN_ALLOCATE);
b->length=0;
return (VOID *)b;
}
void
flush_buffer(bb)
VOID *bb;
{
struct buffer *b;
b=(struct buffer *)bb;
free(b->b);
b->b=0;
b->allocated=0;
b->length=0;
free(b);
}
int
size_buffer(b)
VOID *b;
{
struct buffer *bb;
bb=(struct buffer *)b;
return bb->length;
}
void
add_buffer(bb,p,n)
VOID *bb;
char *p;
int n;
{
struct buffer *b;
b=(struct buffer *)bb;
if(b->length+n>b->allocated) {
b->allocated*=2;
b->b=(char *)ck_realloc(b->b,b->allocated);
}
bcopy(p,b->b+b->length,n);
b->length+=n;
}
void
add1_buffer(bb,ch)
VOID *bb;
int ch;
{
struct buffer *b;
b=(struct buffer *)bb;
if(b->length+1>b->allocated) {
b->allocated*=2;
b->b=(char *)ck_realloc(b->b,b->allocated);
}
b->b[b->length]=ch;
b->length++;
}
char *
get_buffer(bb)
VOID *bb;
{
struct buffer *b;
b=(struct buffer *)bb;
return b->b;
}
#endif