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nroff
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strings.c
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C/C++ Source or Header
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1990-07-23
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5KB
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274 lines
/*
* strings.c - String input/output processing for nroff word processor
*
* adapted for atariST/TOS by Bill Rosenkranz 11/89
* net: rosenkra@hall.cray.com
* CIS: 71460,17
* GENIE: W.ROSENKRANZ
*
* original author:
*
* Stephen L. Browning
* 5723 North Parker Avenue
* Indianapolis, Indiana 46220
*
* history:
*
* - Originally written in BDS C;
* - Adapted for standard C by W. N. Paul
* - Heavily hacked up to conform to "real" nroff by Bill Rosenkranz
*/
#undef NRO_MAIN /* extern globals */
#include <stdio.h>
#include "nroff.h"
/*------------------------------*/
/* defstr */
/*------------------------------*/
defstr (p)
register char *p;
{
/*
* Define a string. top level, read from command line.
*
* we should read string without interpretation EXCEPT:
*
* 1) number registers are interpolated
* 2) strings indicated by \* are interpolated
* 3) arguments indicated by \$ are interpolated
* 4) concealed newlines indicated by \(newline) are eliminated
* 5) comments indicated by \" are eliminated
* 6) \t and \a are interpreted as ASCII h tab and SOH.
* 7) \\ is interpreted as backslash and \. is interpreted as a period.
*
* currently, we do only 3. a good place to do it would be here before
* putstr, after colstr...
*/
register char *q;
register int i;
char name[MNLEN];
char defn[MXMLEN];
name[0] = '\0';
defn[0] = '\0';
/*
* skip the .ds and get to the name...
*/
q = skipwd (p);
q = skipbl (q);
/*
* ok, name now holds the name. make sure it is valid (i.e. first
* char is alpha...). getwrd returns the length of the word.
*/
i = getwrd (q, name);
if (!name[0])
{
fprintf (err_stream,
"***%s: missing or illegal string definition name\n",
myname);
err_exit (-1);
}
/*
* truncate to 2 char max name.
*/
if (i > 2)
name[2] = EOS;
/*
* skip the name to get to the string. it CAN start with a " to
* have leading blanks...
*/
q = skipwd (q);
q = skipbl (q);
/*
* read rest of line from input stream and collect string into
* temp buffer defn
*/
if ((i = colstr (q, defn)) == ERR)
{
fprintf (err_stream,
"***%s: string definition too long\n", myname);
err_exit (-1);
}
/*
* store the string
*/
if (putstr (name, defn) == ERR)
{
fprintf (err_stream,
"***%s: string definition table full\n", myname);
err_exit (-1);
}
}
/*------------------------------*/
/* colstr */
/*------------------------------*/
colstr (p, d)
register char *p;
char *d;
{
/*
* Collect string definition from input stream
*/
register int i = 0;
if (*p == '\"')
p++;
while (*p != EOS)
{
if (i >= MXMLEN - 1)
{
d[i - 1] = EOS;
return (ERR);
}
d[i++] = *p++;
}
d[i] = EOS;
return (i);
}
/*------------------------------*/
/* putstr */
/*------------------------------*/
putstr (name, p)
register char *name;
register char *p;
{
/*
* Put string definition into (macro) table
*
* NOTE: any expansions of things like number registers SHOULD
* have been done already. strings and macros share mb buffer
*/
/*
* any room left? (did we exceed max number of possible macros)
*/
if (mac.lastp >= MXMDEF)
return (ERR);
/*
* will new one fit in big buffer?
*/
if (mac.emb + strlen (name) + strlen (p) + 1 > &mac.mb[MACBUF])
{
return (ERR);
}
/*
* add it...
*
* bump counter, set ptr to name, copy name, copy def.
* finally increment end of macro buffer ptr (emb).
*
* string looks like this in mb:
*
* mac.mb[MACBUF] size of total buf
* lastp < MXMDEF number of macros/strings possible
* *mnames[MXMDEF] -> names, each max length
* ...______________________________...____________________...
* / / /|X|X|0|string definition |0| / / / / / / /
* .../_/_/_|_|_|_|_________________...___|_|/_/_/_/_/_/_/_...
* ^
* |
* \----- mac.mnames[mac.lastp] points here
*
* both the 2 char name (XX) and the descripton are null term and
* follow one after the other.
*/
++mac.lastp;
mac.mnames[mac.lastp] = mac.emb;
strcpy (mac.emb, name);
strcpy (mac.emb + strlen (name) + 1, p);
mac.emb += strlen (name) + strlen (p) + 2;
return (OK);
}
/*------------------------------*/
/* getstr */
/*------------------------------*/
char *getstr (name)
register char *name;
{
/*
* Get (lookup) string definition from namespace
*/
register int i;
/*
* loop for all macros, starting with last one
*/
for (i = mac.lastp; i >= 0; --i)
{
/*
* is this REALLY a macro?
*/
if (mac.mnames[i])
{
/*
* if it compares, return a ptr to it
*/
if (!strcmp (name, mac.mnames[i]))
{
/*!!!debug puts (mac.mnames[i]);*/
if (mac.mnames[i][1] == EOS)
return (mac.mnames[i] + 2);
else
return (mac.mnames[i] + 3);
}
}
}
/*
* none found, return null
*/
return (NULL_CPTR);
}