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output.c
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/*
System: Structured text retrieval tool sgrep.
Module: output.c
Author: Pekka Kilpeläinen & Jani Jaakkola
Description: handles outputting of a gc list ( show_gclist() )
Version history: Original version February 1995 by JJ & PK
Copyright: University of Helsinki, Dept. of Computer Science
*/
/* JJ: Completely rewritten in Sep 11 1998. Using memory mapped files now
* and much cleaner */
#include <stdio.h>
#include <errno.h>
#include <string.h>
#define SGREP_LIBRARY
#include "sgrep.h"
struct DisplayerStruct {
struct SgrepStruct *sgrep;
const FileList *files;
/* Current region */
int region;
/* Current file */
int current_file;
int last; /* total length of all files */
/*
* When not in stream mode, the output won't start at position 0.
* This points out the start of output
*/
int first_ind;
/* Remember last_char in case we need to append newline */
int last_char;
int start_warned; /* Has warnings about too long regions been given ? */
int end_warned;
FILE *stream; /* The output stream to which we are printing */
/* The mapped file */
char *map;
size_t map_size;
};
/*
* Prints a region from file. If necessary opens a new file. Only one file
* is kept open at a time. s and e are offsets into one file, not into whole
* input stream.
*/
const char *get_file_region(Displayer *displayer,int file,
unsigned int start, unsigned int len) {
SGREPDATA(displayer);
if (displayer->current_file!=file) {
/* File changed. */
if (displayer->map) {
/* Unmap previous file */
unmap_file(sgrep,displayer->map,displayer->map_size);
displayer->map=NULL;
displayer->map_size=0;
}
/* FIXME: handle stdin */
displayer->current_file=file;
displayer->map_size=map_file(sgrep,flist_name(displayer->files,
displayer->current_file),
(void **)&displayer->map);
}
if (displayer->map==NULL) return NULL; /* Nothing to do without a map */
if (start>=displayer->map_size || start+len>displayer->map_size) {
sgrep_error(sgrep,"File '%s' truncated?\n",
flist_name(displayer->files,file));
return NULL;
}
return displayer->map+start;
}
void show_file_region(Displayer *displayer,int file,
unsigned int start,unsigned int len) {
const char *r;
r=get_file_region(displayer,file,start,len);
if (r) {
fwrite(r,len,1,displayer->stream);
}
}
/*
* By using constant gc lists it's possible to have regions, which
* exceed input size. So we need to make a check
*/
void check_region(Displayer *displayer, int *start, int *len)
{
SGREPDATA(displayer);
if ( *start>=displayer->last && (!displayer->start_warned) )
{
sgrep_error(sgrep,"Warning: region start point greater than input size detected\n");
displayer->start_warned=1;
*len=0;
return;
}
if (*start+*len>displayer->last && displayer->end_warned)
{
sgrep_error(sgrep,"Warning: region end point greater than input size detected\n");
displayer->end_warned=1;
*len=displayer->last-*start;
}
}
/*
* Locates and maps the correct file for given region start point
* assumes start is correct
*/
int locate_file_num(Displayer *displayer, int start) {
/* Checking the common case: if we already have the right file */
if (displayer->current_file>=0 &&
start>=flist_start(displayer->files,displayer->current_file) &&
start<flist_start(displayer->files,displayer->current_file)+
flist_length(displayer->files,displayer->current_file)) {
return displayer->current_file;
} else {
/* Do the binsearch */
return flist_search(displayer->files,start);
}
}
const char *fetch_region(Displayer *d,Region *region, int *size) {
int fnum;
int start,len;
const char *r;
if (!region || region->start==-1) {
*size=0;
return NULL;
}
start=region->start;
len=region->end-start+1;
check_region(d,&start,&len);
if (len<=0) {
*size=0;
region->start=region->end=-1;
return NULL;
}
fnum=locate_file_num(d,region->start);
start-=flist_start(d->files,fnum);
if (start+len>flist_length(d->files,fnum)) {
/* Region stretches across files: cut the length */
len=flist_length(d->files,fnum)-start;
}
region->start+=len;
r=get_file_region(d,fnum,start,len);
*size= (r)? len : 0;
return r;
}
/*
* Shows a region which might reside in more than one file. This is done
* by finding out the files, where region is and calling show_file_region
*/
void show_region(Displayer *displayer,int start,int len)
{
int fnum;
check_region(displayer,&start,&len);
if (len<=0) return;
fnum=locate_file_num(displayer,start);
assert(fnum>=0 && fnum<flist_files(displayer->files));
while(len>0) {
int fstart,flen;
fstart=start-flist_start(displayer->files,fnum);
flen=flist_length(displayer->files,fnum)-fstart;
if (flen>len) flen=len;
show_file_region(displayer,fnum,fstart,flen);
start+=flen;
len-=flen;
fnum++;
}
}
/*
* Handles % commands in output_style string
*/
void expand(Displayer *displayer, int ch, Region r)
{
/* FIXME: using direct pointer instead of index (i) might be faster.
*/
int i=-1;
displayer->last_char=0;
switch (ch) {
case 'f':
if (r.start>=displayer->last)
{
fputs("<input exceeded>",displayer->stream);
break;
}
if (i==-1) i=flist_search(displayer->files,r.start);
if (i>=0) {
const char *name=flist_name(displayer->files,i);
if (name) {
fputs(name,displayer->stream);
} else {
fputs("<stdin>",displayer->stream);
break;
}
} else {
sgrep_error(displayer->sgrep,
"Could not find file for region (%d,%d)\n",
r.start,r.end);
}
break;
case 's':
fprintf(displayer->stream,"%d",r.start+displayer->first_ind);
break;
case 'e':
fprintf(displayer->stream,"%d",r.end+displayer->first_ind);
break;
case 'l':
fprintf(displayer->stream,"%d",r.end-r.start+1);
break;
case 'i':
if (r.start>displayer->last)
i=flist_files(displayer->files)-1;
else if (i==-1) i=flist_search(displayer->files,r.start);
fprintf(displayer->stream,"%d",
r.start-flist_start(displayer->files,i));
break;
case 'j':
if (r.end>displayer->last)
i=flist_files(displayer->files)-1;
else if (i==-1) i=flist_search(displayer->files,r.end);
fprintf(displayer->stream,"%d",
r.end-flist_start(displayer->files,i));
break;
case 'r':
show_region(displayer,r.start,r.end-r.start+1);
break;
case 'n':
fprintf(displayer->stream,"%d",displayer->region);
break;
case '%':
fputc('%',displayer->stream);
break;
default:
fputc('%',displayer->stream);
fputc(ch,displayer->stream);
displayer->last_char=ch;
break;
}
}
/*
* Handles \ escapes in output_style string
* Note: missing \000 - \377
*/
void escape(Displayer *displayer,int ch)
{
displayer->last_char=0;
switch (ch) {
case 'n':
fputc('\n',displayer->stream);
displayer->last_char='\n';
break;
case 't':
fputc('\t',displayer->stream);
break;
case '\\':
fputc('\\',displayer->stream);
break;
case '\"':
fputc('\"',displayer->stream);
break;
case '\r':
fputc('\r',displayer->stream);
break;
case '\f':
fputc('\f',displayer->stream);
break;
case '\b':
fputc('\b',displayer->stream);
break;
case '%':
fputc('%',displayer->stream);
break;
}
}
/*
* Prints a gc list using output_style and given file list
*/
int display_gc_list(Displayer *displayer,RegionList *l)
{
ListIterator lp;
Region r,p;
int i;
int ch;
struct SgrepStruct *sgrep=displayer->sgrep;
start_region_search(l,&lp);
get_region(&lp,&r);
if (r.start>0 && sgrep->print_all)
{
/* There is text before first region */
show_region(displayer,0,r.start);
}
if (r.start==-1 && sgrep->print_all) {
/* There was no regions, but we are in filter mode */
show_region(displayer,0,displayer->last);
}
while ( r.start!=-1 && (!ferror(displayer->stream)))
{
/* Do the output_style */
for(i=0;(ch=sgrep->output_style[i]);i++)
{
if ( (ch=='%' || ch=='\\') && sgrep->output_style[i+1] )
{
if (ch=='%') expand(displayer,sgrep->output_style[++i],r);
if (ch=='\\') escape(displayer,sgrep->output_style[++i]);
} else
{
fputc(ch,displayer->stream);
displayer->last_char=ch;
}
}
p=r;
get_region(&lp,&r);
if (r.start>0 && p.end<r.start-1 && sgrep->print_all)
{
/* There is text between two regions */
show_region(displayer,p.end+1,r.start-p.end-1);
}
displayer->region++;
}
if ((!ferror(displayer->stream)) &&
r.start==-1 && sgrep->print_all && p.end<displayer->last )
{
/* There is text after last region */
show_region(displayer,p.end+1,displayer->last-p.end-1);
}
if ((!ferror(displayer->stream)) &&
displayer->last_char!='\n' && sgrep->print_newline )
fputc('\n',displayer->stream);
if ((!ferror(displayer->stream))) fflush(displayer->stream);
if (ferror(displayer->stream)) {
sgrep_error(sgrep,"Error writing output: %s\n",strerror(errno));
return SGREP_ERROR;
}
return SGREP_OK;
}
void init_displayer(Displayer *displayer,SgrepData *sgrep, FileList *files) {
displayer->sgrep=sgrep;
displayer->files=files;
displayer->region=1;
displayer->current_file=-1;
displayer->last=flist_total(files);
displayer->first_ind=0;
displayer->last_char=0;
displayer->start_warned=0;
displayer->end_warned=0;
displayer->stream=NULL;
displayer->map=NULL;
displayer->map_size=0;
}
void clean_up_displayer(Displayer *displayer) {
SGREPDATA(displayer);
if (displayer->map!=NULL) {
unmap_file(sgrep,displayer->map,displayer->map_size);
}
}
Displayer *new_displayer(SgrepData *sgrep, FileList *files) {
Displayer *d=sgrep_new(Displayer);
init_displayer(d,sgrep,files);
return d;
}
void delete_displayer(Displayer *d) {
SGREPDATA(d);
clean_up_displayer(d);
sgrep_free(d);
}
int write_region_list(struct SgrepStruct *sgrep,
FILE *stream, RegionList *list, FileList *files) {
int r;
Displayer displayer;
init_displayer(&displayer,sgrep,files);
displayer.stream=stream;
clean_up_displayer(&displayer);
r=display_gc_list(&displayer,list);
return r;
}