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CPMMAKE.ARK
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MACRO.C
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C/C++ Source or Header
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1986-08-31
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2KB
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156 lines
/*
* Macro control for make
*/
#include "h.h"
struct macro * macrohead;
struct macro *
getmp(name)
char * name;
{
register struct macro * rp;
for (rp = macrohead; rp; rp = rp->m_next)
if (strcmp(name, rp->m_name) == 0)
return rp;
return (struct macro *)0;
}
char *
getmacro(name)
char * name;
{
struct macro * mp;
if (mp = getmp(name))
return mp->m_val;
else
return "";
}
struct macro *
setmacro(name, val)
char * name;
char * val;
{
register struct macro * rp;
register char * cp;
/* Replace macro definition if it exists */
for (rp = macrohead; rp; rp = rp->m_next)
if (strcmp(name, rp->m_name) == 0)
{
free(rp->m_val); /* Free space from old */
break;
}
if (!rp) /* If not defined, allocate space for new */
{
if ((rp = (struct macro *)malloc(sizeof (struct macro)))
== (struct macro *)0)
fatal("No memory for macro");
rp->m_next = macrohead;
macrohead = rp;
rp->m_flag = FALSE;
if ((cp = malloc(strlen(name)+1)) == (char *)0)
fatal("No memory for macro");
strcpy(cp, name);
rp->m_name = cp;
}
if ((cp = malloc(strlen(val)+1)) == (char *)0)
fatal("No memory for macro");
strcpy(cp, val); /* Copy in new value */
rp->m_val = cp;
return rp;
}
/*
* Do the dirty work for expand
*/
void
doexp(to, from, len, buf)
char ** to;
char * from;
int * len;
char * buf;
{
register char * rp;
register char * p;
register char * q;
register struct macro * mp;
rp = from;
p = *to;
while (*rp)
{
if (*rp != '$')
{
*p++ = *rp++;
(*len)--;
}
else
{
q = buf;
if (*++rp == '(')
while (*++rp && *rp != ')')
*q++ = *rp;
else if (!*rp)
{
*p++ = '$';
break;
}
else
*q++ = *rp;
*q = '\0';
if (*rp)
rp++;
if (!(mp = getmp(buf)))
mp = setmacro(buf, "");
if (mp->m_flag)
fatal("Infinitely recursive macro %s", mp->m_name);
mp->m_flag = TRUE;
*to = p;
doexp(to, mp->m_val, len, buf);
p = *to;
mp->m_flag = FALSE;
}
if (*len <= 0)
error("Expanded line too line");
}
*p = '\0';
*to = p;
}
/*
* Expand any macros in str.
*/
void
expand(str)
char * str;
{
static char a[LZ];
static char b[LZ];
char * p;
int len = LZ-1;
p = str;
strcpy(a, str);
doexp(&p, a, &len, b);
}