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PdMake
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input.c
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C/C++ Source or Header
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1996-02-15
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7KB
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332 lines
/*
* Parse a makefile
*/
#include <stdio.h>
#include <ctype.h>
#include "h.h"
struct name namehead; /* head of name list */
struct name *firstname;
char str1[LZ]; /* General store */
char str2[LZ];
/* create a symbol table for a name, if one does not already exist */
/*
* Intern a name. Return a pointer to the name struct
*/
struct name *newname(name) char *name;
{
register struct name *rp;
register struct name *rrp;
register char *cp;
extern TimeStamp time_zero; /* a null timestamp */
for
( rp = namehead.n_next, rrp = &namehead; /* for each name */
rp;
rp = rp->n_next, rrp = rrp->n_next
)
if (strcmp(name, rp->n_name) == 0) /* if name found, return it */
return rp;
/* else make a new name, and link it in */
if ((rp = (struct name *)malloc(sizeof (struct name)))
== (struct name *)0)
fatal("No memory for name");
rrp->n_next = rp;
rp->n_next = (struct name *)0;
if ((cp = malloc(strlen(name)+1)) == (char *)0)
fatal("No memory for name");
strcpy(cp, name);
/* initialize name structure */
rp->n_name = cp;
rp->n_line = NULL;
rp->n_time = time_zero;
rp->n_flag = 0;
/* return pointer to new name */
return rp;
}
/*
* Add a dependant to the end of the supplied list of dependants.
* Return the new head pointer for that list.
*/
struct depend *
newdep(np, dp)
struct name * np;
struct depend * dp;
{
register struct depend * rp;
register struct depend * rrp;
if ((rp = (struct depend *)malloc(sizeof (struct depend)))
== (struct depend *)0)
fatal("No memory for dependant");
rp->d_next = (struct depend *)0;
rp->d_name = np;
if (dp == (struct depend *)0)
return rp;
for (rrp = dp; rrp->d_next; rrp = rrp->d_next)
;
rrp->d_next = rp;
return dp;
}
/*
* Add a command to the end of the supplied list of commands.
* Return the new head pointer for that list.
*/
struct cmd *
newcmd(str, cp)
char * str;
struct cmd * cp;
{
register struct cmd * rp;
register struct cmd * rrp;
register char * rcp;
if (rcp = rindex(str, '\n'))
*rcp = '\0'; /* Loose newline */
while (isspace(*str))
str++;
if (*str == '\0') /* If nothing left, the exit */
return;
if ((rp = (struct cmd *)malloc(sizeof (struct cmd)))
== (struct cmd *)0)
fatal("No memory for command");
rp->c_next = (struct cmd *)0;
if ((rcp = malloc(strlen(str)+1)) == (char *)0)
fatal("No memory for command");
strcpy(rcp, str);
rp->c_cmd = rcp;
if (cp == (struct cmd *)0)
return rp;
for (rrp = cp; rrp->c_next; rrp = rrp->c_next)
;
rrp->c_next = rp;
return cp;
}
/*
* Add a new 'line' of stuff to a target. This check to see
* if commands already exist for the target. If flag is set,
* the line is a double colon target.
*
* Kludges:
* i) If the new name begins with a '.', and there are no dependents,
* then the target must cease to be a target. This is for .SUFFIXES.
* ii) If the new name begins with a '.', with no dependents and has
* commands, then replace the current commands. This is for
* redefining commands for a default rule.
* Neither of these free the space used by dependents or commands,
* since they could be used by another target.
*/
void
newline(np, dp, cp, flag)
struct name * np;
struct depend * dp;
struct cmd * cp;
{
bool hascmds = FALSE; /* Target has commands */
register struct line * rp;
register struct line * rrp;
/* Handle the .SUFFIXES case */
if (np->n_name[0] == '.' && !dp && !cp)
{
for (rp = np->n_line; rp; rp = rrp)
{
rrp = rp->l_next;
free(rp);
}
np->n_line = (struct line *)0;
np->n_flag &= ~N_TARG;
return;
}
/* This loop must happen since rrp is used later. */
for
(
rp = np->n_line, rrp = (struct line *)0;
rp;
rrp = rp, rp = rp->l_next
)
if (rp->l_cmd)
hascmds = TRUE;
if (hascmds && cp && !(np->n_flag & N_DOUBLE))
/* Handle the implicit rules redefinition case */
if (np->n_name[0] == '.' && dp == (struct depend *)0)
{
np->n_line->l_cmd = cp;
return;
}
else
error("Commands defined twice for target %s", np->n_name);
if (np->n_flag & N_TARG)
if (!(np->n_flag & N_DOUBLE) != !flag) /* like xor */
error("Inconsistent rules for target %s", np->n_name);
if ((rp = (struct line *)malloc(sizeof (struct line)))
== (struct line *)0)
fatal("No memory for line");
rp->l_next = (struct line *)0;
rp->l_dep = dp;
rp->l_cmd = cp;
if (rrp)
rrp->l_next = rp;
else
np->n_line = rp;
np->n_flag |= N_TARG;
if (flag)
np->n_flag |= N_DOUBLE;
}
/*
* Parse input from the makefile, and construct a tree structure
* of it.
*/
void input()
{
char *p; /* General */
char *q;
struct name *np;
struct depend *dp;
struct cmd *cp;
bool dbl;
if (getline(str1)) return; /* Read the first line */
for(;;)
{ if (*str1 == '\t') /* Rules without targets */
error("Command found with no target/dependancy line");
p = str1;
while (isspace(*p)) /* Find first target */
p++;
while (((q = index(p, '=')) != (char *)0) &&
(p != q) && (q[-1] == '\\')) /* Find value */
{
register char * a;
a = q - 1; /* Del \ chr; move rest back */
p = q;
while(*a++ = *q++)
;
}
if (q != (char *)0)
{
register char * a;
*q++ = '\0'; /* Separate name and val */
while (isspace(*q))
q++;
if (p = rindex(q, '\n'))
*p = '\0';
p = str1;
if ((a = gettok(&p)) == (char *)0)
error("No macro name");
setmacro(a, q);
if (getline(str1)) return;
continue;
}
expand(str1);
p = str1;
while (((q = index(p, ':')) != (char *)0) &&
(p != q) && (q[-1] == '\\')) /* Find dependents */
{
register char * a;
a = q - 1; /* Del \ chr; move rest back */
p = q;
while(*a++ = *q++)
;
}
if (q == (char *)0)
error("No targets provided");
*q++ = '\0'; /* Separate targets and dependents */
if (*q == ':') /* Double colon */
{
dbl = 1;
q++;
}
else
dbl = 0;
for (dp = (struct depend *)0; ((p = gettok(&q)) != (char *)0);)
/* get list of dep's */
{
np = newname(p); /* Intern name */
dp = newdep(np, dp); /* Add to dep list */
}
*((q = str1) + strlen(str1) + 1) = '\0';
/* Need two nulls for gettok (Remember separation) */
cp = (struct cmd *)0;
if (getline(str2) == FALSE) /* Get commands */
{
while (*str2 == '\t')
{
cp = newcmd(&str2[0], cp);
if (getline(str2))
break;
}
}
while ((p = gettok(&q)) != (char *)0) /* Get list of targ's */
{
np = newname(p); /* Intern name */
newline(np, dp, cp, dbl);
if (!firstname && p[0] != '.')
firstname = np;
}
if (nestlvl < 0) /* EOF? */
return;
strcpy(str1, str2);
}
}