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input.c
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C/C++ Source or Header
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1990-04-19
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7KB
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327 lines
/*
* Parse a makefile
*/
#include <stdio.h>
#include <ctype.h>
#include "h.h"
struct name namehead;
struct name *firstname;
char str1[LZ]; /* General store */
char str2[LZ];
/*
* 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;
for
(
rp = namehead.n_next, rrp = &namehead;
rp;
rp = rp->n_next, rrp = rrp->n_next
)
if (strcmp(name, rp->n_name) == 0)
return rp;
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((unsigned) strlen(name) + 1)) == (char *) 0)
fatal("No memory for name");
strcpy(cp, name);
rp->n_name = cp;
rp->n_line = (struct line *) 0;
rp->n_time = (time_t) 0;
rp->n_flag = 0;
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 (struct cmd *) 0;
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((unsigned) 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 flag;
{
int 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((char *) 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(fd)
FILE *fd;
{
char *p; /* General */
char *q;
struct name *np;
struct depend *dp;
struct cmd *cp;
#ifdef pdc
unsigned int dbl;
bool getline();
#else
bool dbl, getline();
#endif
if (getline(str1, fd)) /* Read the first line */
return;
for (;;) {
#ifdef os9
if (*str1 == ' ') /* Rules without targets */
# else
if (*str1 == '\t') /* Rules without targets */
# endif
error("Rules not allowed here");
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, fd))
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, fd) == FALSE) { /* Get commands */
#ifdef os9
while (*str2 == ' ')
#else
while (*str2 == '\t')
#endif
{
cp = newcmd(&str2[0], cp);
if (getline(str2, fd))
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 (feof(fd)) /* EOF? */
return;
strcpy(str1, str2);
}
}