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/*
\funcref{directive}{void directive ()}
{}
{}
{error(), pushfile(), insert()}
{lexer()}
{directiv.c}
{
{\em directive()} is called from {\em lexer()} when a `\#' character is
read in the input file. {\em directive()} does not expect to read the
`\#' character. Three directives are recognized:
\begin{itemize}
\item {\bf \#} {\em [spaces]} {\bf include} {\em [spaces]} {\bf
"}{\em filename}{\bf "}. When this directive is read, {\em
pushfile()} is called to start processing the included file.
Analogous to {\bf C}, an {\bf \#include} $<$...$>$ form is
supported.
\item {\bf \#} {\em [spaces]} {\bf define} {\em [spaces]} {\em name}
{\em [spaces]} {\em [redefinition]}. When this directive is read,
{\em insert()} is called to insert the definition in the symbol
table. The defined {\em name} is passed to {\em insert()} as
argument; the redefinition is stored in the lexical buffer {\em
lexbuf}.
\item {\bf \#\!} \ldots
The line containing this directive is skipped. The directive is
intended to be used on {\sc unix} platforms, where it can be used
to execute an icmake script.
\end{itemize}
Other directives following the `\#' character lead to an error.
}
*/
#include "icm-pp.h"
static int isdefd (char *id)
{
register int
i;
if ( (i = finddef (id)) < 0 ||
(!strcmp (defined [i].redef, "0"))
)
return (0);
return (1);
}
void directive ()
{
register int
imdir_used,
index,
ch;
static char
dirsep [2] = { DIRSEP, '\0' },
idname [200];
char
filename [_MAX_PATH];
/* directive is #! */
if ((ch = fgetc (filestack [filesp].f)) == '!')
{ /* skip while not \n and not EOF */
while ((ch = fgetc (filestack [filesp].f)) != '\n' && ch != EOF)
;
ungetc (ch, filestack [filesp].f); /* push back that char */
return; /* all done here */
}
/* not #!, but maybe '# ' */
while (ch == ' ' || ch == '\t') /* skip all blanks */
ch = fgetc (filestack [filesp].f);
ungetc (ch, filestack [filesp].f); /* push back next char, not ' ' */
if (! fscanf (filestack [filesp].f, "%s", lexbuf))
error ("%s: %d: bad preprocessor directive",
filestack [filesp].n, filestack [filesp].l);
if (! strncmp (lexbuf, "include", 7))
{
imdir_used = 0; /* assume include "..." form */
while ( (ch = fgetc (filestack [filesp].f)) == ' ' ||
ch == '\t'
)
;
if (ch != '\"' && ch != '<')
error ("%s: %d: \" or < expected after #include directive",
filestack [filesp].n, filestack [filesp].l);
if (ch == '<') /* include <...> form? */
imdir_used++;
index = 0;
while ( (ch = fgetc (filestack [filesp].f)) != '\"' && ch != '>')
if (ch == '\n' || ch == EOF)
error ("%s: %d: unterminated name after #include directive",
filestack [filesp].n, filestack [filesp].l);
else
lexbuf [index++] = (char) ch;
lexbuf [index] = '\0';
while ( (ch = fgetc (filestack [filesp].f)) != '\n' &&
ch != EOF)
;
ungetc (ch, filestack [filesp].f);
if (output_active)
{
if (imdir_used)
{
strcpy (filename, imdir);
strcat (filename, dirsep);
strcat (filename, lexbuf);
pushfile (filename);
}
else
pushfile (lexbuf);
}
}
else if (! strncmp (lexbuf, "define", 6))
{
while /* define read, skip blanks */
(
(ch = fgetc (filestack [filesp].f)) == ' '
||
ch == '\t'
)
;
ungetc (ch, filestack [filesp].f); /* push back first non-blank */
getident (idname); /* get the name of the define */
while /* skip blanks again */
(
(ch = fgetc (filestack [filesp].f)) == ' '
||
ch == '\t'
)
;
ungetc (ch, filestack [filesp].f); /* and push-back non-blank */
index = 0; /* read the line-remainder */
while
(
(ch = fgetc (filestack [filesp].f)) != '\n'
&&
ch != EOF
)
lexbuf [index++] = (char) ch;
lexbuf [index] = '\0'; /* terminate the line */
no_comment(); /* remove comment from lexbuf */
ungetc (ch, filestack [filesp].f);
if (output_active)
insert (idname);
}
else if (! strncmp (lexbuf, "ifndef", 6))
{
/* skip blanks */
while ( (ch = fgetc (filestack [filesp].f)) == ' ' || ch == '\t')
;
ungetc (ch, filestack [filesp].f); /* push back first non-blank */
getident (idname); /* get the name of the define */
/* terminate the line */
while ( (ch = fgetc (filestack [filesp].f)) != '\n' )
if (ch == EOF)
error ("%s: #ifndef at end-of-file",
filestack [filesp].n);
ungetc (ch, filestack [filesp].f); /* and push-back non-blank */
output_active = ! isdefd (idname);
}
else if (! strncmp (lexbuf, "ifdef", 5))
{
/* skip blanks */
while ( (ch = fgetc (filestack [filesp].f)) == ' ' || ch == '\t')
;
ungetc (ch, filestack [filesp].f); /* push back first non-blank */
getident (idname); /* get the name of the define */
/* terminate the line */
while ( (ch = fgetc (filestack [filesp].f)) != '\n' )
if (ch == EOF)
error ("%s: #ifdef at end-of-file",
filestack [filesp].n);
ungetc (ch, filestack [filesp].f); /* and push-back non-blank */
output_active = isdefd (idname);
}
else if (! strncmp (lexbuf, "else", 4))
{
/* terminate the line */
while ( (ch = fgetc (filestack [filesp].f)) != '\n' )
if (ch == EOF)
error ("%s: #else at end-of-file",
filestack [filesp].n);
ungetc (ch, filestack [filesp].f); /* and push-back non-blank */
output_active = !output_active;
}
else if (! strncmp (lexbuf, "endif", 5))
{
/* terminate the line */
while ( (ch = fgetc (filestack [filesp].f)) != '\n' )
if (ch == EOF)
error ("%s: #ifdef at end-of-file",
filestack [filesp].n);
ungetc (ch, filestack [filesp].f); /* and push-back non-blank */
output_active = 1;
}
else
error ("%s: %d: bad preprocessor directive",
filestack [filesp].n, filestack [filesp].l);
}
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