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OS/2 Shareware BBS: 5 Edit
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text-table.cc
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C/C++ Source or Header
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1997-04-12
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7KB
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327 lines
/* $Id: text-table.cc,v 1.14 1997/04/13 04:26:42 dps Exp $ */
/* Ascii table layout */
#ifdef __GNUC__
#define alloca __builtin_alloca
#else
#if HAVE_ALLOCA_H
#include <alloca.h>
#else /* Do not have alloca.h */
#ifdef _AIX
#pragma alloca
#else /* not _AIX */
char *alloca();
#endif /* _AIX */
#endif /* HAVE_ALLOCA_H */
#endif /* __GNUC__ */
#include <iostream.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "tblock.h"
#include "text-table.h"
#include "lib.h"
struct rdata
{
struct wd_info w;
const char *data;
};
/* Print out a number of spaces */
static inline void p_sp(int n, FILE *out)
{
int i;
for (i=0; i<n; i++)
fputc(' ', out);
}
/* Print row after folding of columns has been done */
static void basic_print_row(int ncols,
const struct rdata *cols,
char sep, FILE *out)
{
const char **lptr, *s, *t;
int i, flg, nsp;
align_t al;
num_info n;
/* Alloca line position pointers */
if ((lptr=(const char **) alloca(ncols*sizeof(const char *)))==NULL)
{
fprintf(stderr, "basic_print_row: fatal alloca failure\n");
exit(1);
}
for (i=0; i<ncols; i++)
lptr[i]=cols[i].data;
while (1)
{
/* Check for some content */
flg=0;
for (i=0; i<ncols; i++)
if (*lptr[i]!='\0')
flg=1;
if (!flg) break;
/* Print the content */
for (i=0; i<ncols; i++)
{
s=lptr[i];
/* Find the extent and decimal point pos of current item */
for (t=s, nsp=cols[i].w.width; *t!='\0'; nsp--, t++)
{
if (*t=='\n')
break;
}
if (s==t)
{
p_sp(nsp, out);
}
else
{
/* There is some content, print it */
al=cols[i].w.align;
if (cols[i].w.dp_col>=0)
{
n=scan_num(s);
if (n.dot_pos!=-1)
{
p_sp(cols[i].w.dp_col-n.dot_pos, out);
fwrite((void *) s, sizeof(char), t-s, out);
p_sp(nsp-cols[i].w.dp_col+n.dot_pos, out);
al=ALIGN_DP;
}
}
switch(al)
{
case ALIGN_DP:
break;
case ALIGN_LEFT:
fwrite((void *) s, sizeof(char), t-s, out);
p_sp(nsp, out);
break;
case ALIGN_CENTER:
p_sp(nsp/2, out);
fwrite((void *) s, sizeof(char), t-s, out);
p_sp(nsp-(nsp/2), out); // Avoid rounding related problems
break;
case ALIGN_RIGHT:
p_sp(nsp, out);
fwrite((void *) s, sizeof(char), t-s, out);
break;
default:
fprintf(stderr,"basic_print_row: Invalid alignment\n");
break;
}
}
fputc(sep, out); // Seperate columns by a space
/* Update lptr[i] */
if (*t=='\n')
t++; // Advance past newlines;
lptr[i]=t;
}
fputc('\n', out); // Print out a newline
}
}
/* Split the elements of a row */
static void print_row(int ncols, const struct rdata *dp, FILE *out)
{
static const char null_string[]={'\0'};
struct rdata *rd;
tblock *d;
char *s, *t;
int i;
/* Allocate structures */
if ((rd=(struct rdata *) alloca(ncols*sizeof(rdata)))==NULL)
{
fprintf(stderr, "print_row: fatal alloca failure\n");
exit(1);
}
/* Fold lines */
for (i=0; i<ncols; i++)
{
rd[i].w=dp[i].w;
if (dp[i].data==NULL)
{
rd[i].data=null_string; // Avoid complication of null in
// basic_print_row
continue; // Move on to next item
}
d=word_wrap(dp[i].data, "\n", "\n", dp[i].w.width, 0);
if ((rd[i].data=strdup(*d))==NULL)
{
fprintf(stderr, "text_table::print_row: fatal alloca failure\n");
exit(1);
}
else
{
/* Filter out CH_SUSPECT */
for(s=t=(char *) rd[i].data; *s!='\0'; s++)
{
if (*s==CH_SUSPECT)
continue;
*(t++)=*s;
}
*t='\0';
}
delete(d);
}
basic_print_row(ncols, rd, ' ', out); // Printing the rows is actually
// quite complex.
for (i=0; i<ncols; i++)
{
if (rd[i].data!=null_string)
free((void *) rd[i].data); // Free data
}
}
/* O(n^2) table width reduction algorithm, n is small in almost all cases */
static void shrink_widths(int ncols, struct rdata *cols, int mtw)
{
int i, j, tw, maxw;
for (tw=0, i=0; i<ncols; i++)
tw+=cols[i].w.width;
mtw-=ncols; // Take account of column seperators
/* Simply reduce the maximum width column width by one until
enougn has been trimed */
while (tw>mtw)
{
maxw=0; j=-1;
for (i=0; i<ncols; i++)
{
if (maxw<cols[i].w.width && cols[i].w.align!=ALIGN_DP)
{
j=i;
maxw=cols[i].w.width;
}
}
if (j==-1)
{
fprintf(stderr, "Can not shrink overwidth table\n");
continue;
}
cols[j].w.width--;
tw--;
}
}
/* Returns NULL or text message */
const char *text_table::print_table(int wd, FILE *out)
{
int i,j;
struct rdata *d;
const struct col_info *col;
if ((d=(struct rdata *) alloca(cols*sizeof(struct rdata)))==NULL)
{
cerr<<"text_table::print_table alloca failute (fatal)\n";
return "[Table omitted due to lack of memory]";
}
if (cols==0 || rows==0)
{
fputs("[empty tabel ignored]\n", out);
return "[Ignored empty table]";
}
for (i=0, col=cdata; col!=NULL; i++, col=col->next)
d[i].w=find_width(rows, col->data);
shrink_widths(cols, d, wd);
for (i=0; i<rows; i++)
{
for (j=0, col=cdata; col!=NULL; j++, col=col->next)
d[j].data=(col->data)[i];
print_row(cols, d, out);
}
return NULL;
}
/* Set */
int text_table::set(int c, int r, const char *s)
{
struct col_info *col;
int i;
if (c<0 || c>=cols || r<0 || r>=rows)
{
cerr<<"Invalid request to set "<<c<<','<<r<<" in "
<<cols<<'x'<<rows<<" table (value "<<s<<")\n";
return 0;
}
for (col=cdata, i=0; i<c && col!=NULL; i++, col=col->next) ;
if (col!=NULL)
{
if (col->data[r]!=NULL)
free((void *) col->data[r]);
col->data[r]=strdup(s);
}
return 1;
}
/* Constructor */
text_table::text_table(int c, int r)
{
int i, j;
struct col_info *col, **nptr;
cols=c;
rows=r;
cdata=NULL; // Hardenning against cols=0
for (nptr=&cdata, i=0; i<cols; i++)
{
col=new(struct col_info);
*nptr=col;
col->next=NULL;
nptr=&(col->next);
if ((col->data=
(const char **) malloc(rows*(sizeof(const char *))))==NULL)
{
cerr<<"text_table::constructor: malloc failure (fatal)\n";
exit(1);
}
for (j=0; j<rows; j++)
(col->data)[j]=NULL;
}
}
/* Destructor */
text_table::~text_table(int c, int r)
{
int i;
struct col_info *col, *nxt;
for (col=cdata; col!=NULL;)
{
for (i=0; i<rows; i++)
if (col->data[i]==NULL)
free((void *) col->data[i]);
nxt=col->next;
free(col);
col=nxt;
}
}