Category : C Source Code
Archive   : OHLMAKE.ZIP
Filename : VARIABLE.C

 
Output of file : VARIABLE.C contained in archive : OHLMAKE.ZIP
/* Internals of variables for GNU Make.
Copyright (C) 1988, 1989, 1990 Free Software Foundation, Inc.
This file is part of GNU Make.

GNU Make is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.

GNU Make is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Make; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */

#include "make.h"
#include "commands.h"
#include "variable.h"
#include "dep.h"
#include "file.h"

#ifdef __GNUC__
#define max(a, b) \
({ register int __a = (a), __b = (b); __a > __b ? __a : __b; })
#else
#define max(a, b) ((a) > (b) ? (a) : (b))
#endif


/* Hash table of all global variable definitions. */

#ifndef VARIABLE_BUCKETS
#define VARIABLE_BUCKETS 523
#endif
#ifndef PERFILE_VARIABLE_BUCKETS
#define PERFILE_VARIABLE_BUCKETS 23
#endif
#ifndef SMALL_SCOPE_VARIABLE_BUCKETS
#define SMALL_SCOPE_VARIABLE_BUCKETS 13
#endif
static struct variable *variable_table[VARIABLE_BUCKETS];
static struct variable_set global_variable_set
= { variable_table, VARIABLE_BUCKETS };
static struct variable_set_list global_setlist
= { 0, &global_variable_set };
struct variable_set_list *current_variable_set_list = &global_setlist;

/* The next two describe the variable output buffer.
This buffer is used to hold the variable-expansion of a line of the
makefile. It is made bigger with realloc whenever it is too small.
variable_buffer_length is the size currently allocated.
variable_buffer is the address of the buffer. */

static unsigned int variable_buffer_length;
static char *variable_buffer;

/* Implement variables. */

/* Define variable named NAME with value VALUE in SET. VALUE is copied.
LENGTH is the length of NAME, which does not need to be null-terminated.
ORIGIN specifies the origin of the variable (makefile, command line
or environment).
If RECURSIVE is nonzero a flag is set in the variable saying
that it should be recursively re-expanded. */

static struct variable *
define_variable_in_set (name, length, value, origin, recursive, set)
char *name;
unsigned int length;
char *value;
enum variable_origin origin;
int recursive;
struct variable_set *set;
{
register unsigned int i;
register unsigned int hashval;
register struct variable *v;

hashval = 0;
for (i = 0; i < length; ++i)
HASH (hashval, name[i]);
hashval %= set->buckets;

for (v = set->table[hashval]; v != 0; v = v->next)
if (*v->name == *name
&& !strncmp (v->name + 1, name + 1, length - 1)
&& v->name[length] == '\0')
break;

if (env_overrides && origin == o_env)
origin = o_env_override;

if (v != 0)
{
if (env_overrides && v->origin == o_env)
v->origin = o_env_override;
/* A variable of this name is already defined.
If the old definition is from a stronger source
than this one, don't redefine it. */
if ((int) origin >= (int) v->origin)
{
v->value = savestring (value, strlen (value));
v->origin = origin;
v->recursive = recursive;
}
return v;
}

/* Create a new variable definition and add it to the hash table. */

v = (struct variable *) xmalloc (sizeof (struct variable));
v->name = savestring (name, length);
v->value = savestring (value, strlen (value));
v->origin = origin;
v->recursive = recursive;
v->expanding = 0;
v->next = set->table[hashval];
set->table[hashval] = v;
return v;
}

/* Define a variable in the current variable set. */

struct variable *
define_variable (name, length, value, origin, recursive)
char *name;
unsigned int length;
char *value;
enum variable_origin origin;
int recursive;
{
return define_variable_in_set (name, length, value, origin, recursive,
current_variable_set_list->set);
}

/* Define a variable in FILE's variable set. */

struct variable *
define_variable_for_file (name, length, value, origin, recursive, file)
char *name;
unsigned int length;
char *value;
enum variable_origin origin;
int recursive;
struct file *file;
{
return define_variable_in_set (name, length, value, origin, recursive,
file->variables->set);
}

/* Lookup a variable whose name is a string starting at NAME
and with LENGTH chars. NAME need not be null-terminated.
Returns address of the `struct variable' containing all info
on the variable, or nil if no such variable is defined. */

struct variable *
lookup_variable (name, length)
char *name;
unsigned int length;
{
register struct variable_set_list *setlist;

register unsigned int i;
register unsigned int rawhash = 0;

for (i = 0; i < length; ++i)
HASH (rawhash, name[i]);

for (setlist = current_variable_set_list;
setlist != 0; setlist = setlist->next)
{
register struct variable_set *set = setlist->set;
register unsigned int hashval = rawhash % set->buckets;
register struct variable *v;

for (v = set->table[hashval]; v != 0; v = v->next)
if (*v->name == *name
&& !strncmp (v->name + 1, name + 1, length - 1)
&& v->name[length] == 0)
return v;
}

return 0;
}

/* Initialize FILE's variable set list. If FILE already has a variable set
list, the topmost variable set is left intact, but the the rest of the
chain is replaced with FILE->parent's setlist. */

void
initialize_file_variables (file)
struct file *file;
{
register struct variable_set_list *l = file->variables;
if (l == 0)
{
l = (struct variable_set_list *)
xmalloc (sizeof (struct variable_set_list));
l->set = (struct variable_set *) xmalloc (sizeof (struct variable_set));
l->set->buckets = PERFILE_VARIABLE_BUCKETS;
l->set->table = (struct variable **)
xmalloc (l->set->buckets * sizeof (struct variable *));
bzero ((char *) l->set->table,
l->set->buckets * sizeof (struct variable *));
file->variables = l;
}

if (file->parent == 0)
l->next = &global_setlist;
else
{
if (file->parent->variables == 0)
initialize_file_variables (file->parent);
l->next = file->parent->variables;
}
}

/* Pop the top set off the current variable set list,
and free all its storage. */

void
pop_variable_scope ()
{
register struct variable_set_list *setlist = current_variable_set_list;
register struct variable_set *set = setlist->set;
register unsigned int i;

current_variable_set_list = setlist->next;
free ((char *) setlist);

for (i = 0; i < set->buckets; ++i)
{
register struct variable *next = set->table[i];
while (next != 0)
{
register struct variable *v = next;
next = v->next;

free (v->name);
free ((char *) v);
}
}
free ((char *) set->table);
free ((char *) set);
}

/* Create a new variable set and push it on the current setlist. */

void
push_new_variable_scope ()
{
register struct variable_set_list *setlist;
register struct variable_set *set;

set = (struct variable_set *) xmalloc (sizeof (struct variable_set));
set->buckets = SMALL_SCOPE_VARIABLE_BUCKETS;
set->table = (struct variable **)
xmalloc (set->buckets * sizeof (struct variable *));
bzero ((char *) set->table, set->buckets * sizeof (struct variable *));

setlist = (struct variable_set_list *)
xmalloc (sizeof (struct variable_set_list));
setlist->set = set;
setlist->next = current_variable_set_list;
current_variable_set_list = setlist;
}

/* Merge SET1 into SET0, freeing unused storage in SET1. */

static void
merge_variable_sets (set0, set1)
struct variable_set *set0, *set1;
{
register unsigned int bucket1;

for (bucket1 = 0; bucket1 < set1->buckets; ++bucket1)
{
register struct variable *v1 = set1->table[bucket1];
while (v1 != 0)
{
struct variable *next = v1->next;
unsigned int bucket0;
register struct variable *v0;

if (set1->buckets >= set0->buckets)
bucket0 = bucket1;
else
{
register char *n;
bucket0 = 0;
for (n = v1->name; *n != '\0'; ++n)
HASH (bucket0, *n);
}
bucket0 %= set0->buckets;

for (v0 = set0->table[bucket0]; v0 != 0; v0 = v0->next)
if (streq (v0->name, v1->name))
break;

if (v0 == 0)
{
/* There is no variable in SET0 with the same name. */
v1->next = set0->table[bucket0];
set0->table[bucket0] = v1;
}
else
{
/* The same variable exists in both sets.
SET0 takes precedence. */
free (v1->value);

free ((char *) v1);
}

v1 = next;
}
}
}

/* Merge SETLIST1 into SETLIST0, freeing unused storage in SETLIST1. */

void
merge_variable_set_lists (setlist0, setlist1)
struct variable_set_list **setlist0, *setlist1;
{
register struct variable_set_list *list0 = *setlist0;
struct variable_set_list *last0 = 0;

while (setlist1 != 0 && list0 != 0)
{
struct variable_set_list *next = setlist1;
setlist1 = setlist1->next;

merge_variable_sets (list0->set, next->set);

free ((char *) next);

last0 = list0;
list0 = list0->next;
}

if (setlist1 != 0)
{
if (last0 == 0)
*setlist0 = setlist1;
else
last0->next = setlist1;
}
}

/* Define the automatic variables, and record the addresses
of their structures so we can change their values quickly. */

void
define_automatic_variables ()
{
register struct variable *v;
char buf[100];

sprintf (buf, "%u", makelevel);
(void) define_variable ("MAKELEVEL", 9, buf, o_env, 0);

/* This won't override any definition, but it
will provide one if there isn't one there. */
v = define_variable ("SHELL", 5, "/bin/sh", o_default, 0);

/* Don't let SHELL come from the environment
if MAKELEVEL is 0. Also, SHELL must not be empty. */
if (*v->value == '\0' || (v->origin == o_env && makelevel == 0))
{
v->origin = o_file;
v->value = savestring ("/bin/sh", 7);
}
}

/* Subroutine of variable_expand and friends:
The text to add is LENGTH chars starting at STRING to the variable_buffer.
The text is added to the buffer at PTR, and the updated pointer into
the buffer is returned as the value. Thus, the value returned by
each call to variable_buffer_output should be the first argument to
the following call. */

char *
variable_buffer_output (ptr, string, length)
char *ptr, *string;
unsigned int length;
{
register unsigned int newlen = length + (ptr - variable_buffer);

if (newlen > variable_buffer_length)
{
unsigned int offset = ptr - variable_buffer;
variable_buffer_length = max (2 * variable_buffer_length, newlen + 100);
variable_buffer = (char *) xrealloc (variable_buffer,
variable_buffer_length);
ptr = variable_buffer + offset;
}

bcopy (string, ptr, length);
return ptr + length;
}

/* Return a pointer to the beginning of the variable buffer. */

char *
initialize_variable_output ()
{
/* If we don't have a variable output buffer yet, get one. */

if (variable_buffer == 0)
{
variable_buffer_length = 200;
variable_buffer = (char *) xmalloc (variable_buffer_length);
}

return variable_buffer;
}

/* Create a new environment for FILE's commands.
The child's MAKELEVEL variable is incremented. */

char **
target_environment (file)
struct file *file;
{
register struct variable_set_list *s;
struct variable_bucket
{
struct variable_bucket *next;
struct variable *variable;
};
struct variable_bucket **table;
unsigned int buckets;
register unsigned int i;
register unsigned nvariables;
char **result;

/* Find the lowest number of buckets in any set in the list. */
s = file->variables;
buckets = s->set->buckets;
for (s = s->next; s != 0; s = s->next)
if (s->set->buckets < buckets)
buckets = s->set->buckets;

/* Temporarily allocate a table with that many buckets. */
table = (struct variable_bucket **)
alloca (buckets * sizeof (struct variable_bucket *));
bzero ((char *) table, buckets * sizeof (struct variable_bucket *));

/* Run through all the variable sets in the list,
accumulating variables in TABLE. */
nvariables = 0;
for (s = file->variables; s != 0; s = s->next)
{
register struct variable_set *set = s->set;
for (i = 0; i < set->buckets; ++i)
{
register struct variable *v;
for (v = set->table[i]; v != 0; v = v->next)
{
unsigned int j = i % buckets;
register struct variable_bucket *ov;
register char *p = v->name;

if (v->origin == o_default
|| streq (p, "MAKELEVEL"))
continue;

if (*p != '_' && (*p < 'A' || *p > 'Z')
&& (*p < 'a' || *p > 'z'))
continue;
for (++p; *p != '\0'; ++p)
if (*p != '_' && (*p < 'a' || *p > 'z')
&& (*p < 'A' || *p > 'Z') && (*p < '0' || *p > '9'))
break;
if (*p != '\0')
continue;

for (ov = table[j]; ov != 0; ov = ov->next)
if (streq (v->name, ov->variable->name))
break;
if (ov == 0)
{
register struct variable_bucket *entry;
entry = (struct variable_bucket *)
alloca (sizeof (struct variable_bucket));
entry->next = table[j];
entry->variable = v;
table[j] = entry;
++nvariables;
}
}
}
}

result = (char **) xmalloc ((nvariables + 2) * sizeof (char *));
nvariables = 0;
for (i = 0; i < buckets; ++i)
{
register struct variable_bucket *b;
for (b = table[i]; b != 0; b = b->next)
{
register struct variable *v = b->variable;
result[nvariables++] = concat (v->name, "=", v->value);
}
}
result[nvariables] = (char *) xmalloc (100);
(void) sprintf (result[nvariables], "MAKELEVEL=%u", makelevel + 1);
result[++nvariables] = 0;

return result;
}

/* Try to interpret LINE (a null-terminated string)
as a variable definition. If it is one, define the
variable and return 1. Otherwise return 0.

ORIGIN may be o_file, o_override, o_env, o_env_override,
or o_command specifying that the variable definition comes
from a makefile, an override directive, the environment with
or without the -e switch, or the command line.

A variable definition has the form "name = value" or "name := value".
Any whitespace around the "=" or ":=" is removed. The first form
defines a variable that is recursively re-evaluated. The second form
defines a variable whose value is variable-expanded at the time of
definition and then is evaluated only once at the time of expansion. */

int
try_variable_definition (line, origin)
char *line;
enum variable_origin origin;
{
register int c;
register char *p = line;
register char *beg;
register char *end;
register int recursive;

if (*p == '\t')
return 0;
while (1)
{
c = *p++;
if (c == '\0' || c == '#')
return 0;
if (c == '=')
{
recursive = 1;
break;
}
else if (c == ':')
if (*p == '=')
{
++p;
recursive = 0;
break;
}
else
return 0;
}

beg = next_token (line);
end = p - 1;
if (!recursive)
--end;
while (end[-1] == ' ' || end[-1] == '\t')
--end;
p = next_token (p);

(void) define_variable (beg, end - beg, recursive ? p : variable_expand (p),
origin, recursive);

return 1;
}

/* Print information for variable V, prefixing it with PREFIX. */

static void
print_variable (v, prefix)
register struct variable *v;
char *prefix;
{
char *origin;

switch (v->origin)
{
case o_default:
origin = "default";
break;
case o_env:
origin = "environment";
break;
case o_file:
origin = "makefile";
break;
case o_env_override:
origin = "environment under -e";
break;
case o_command:
origin = "command line";
break;
case o_override:
origin = "`override' directive";
break;
case o_automatic:
origin = "automatic";
break;
case o_invalid:
default:
abort ();
break;
}
printf ("# %s\n", origin);

fputs (prefix, stdout);

/* Is this a `define'? */
if (v->recursive && index (v->value, '\n') != 0)
printf ("define %s\n%sendef\n", v->name, v->value);
else
{
register char *p;

printf ("%s %s= ", v->name, v->recursive ? "" : ":");

/* Check if the value is just whitespace. */

p = next_token (v->value);
if (p != v->value && *p == '\0')
/* All whitespace. */
printf ("$(subst ,,%s)", v->value);
else if (v->recursive)
fputs (v->value, stdout);
else
/* Double up dollar signs. */
for (p = v->value; *p != '\0'; ++p)
{
if (*p == '$')
putchar ('$');
putchar (*p);
}
putchar ('\n');
}
}


/* Print all the variables in SET. PREFIX is printed before
the actual variable definitions (everything else is comments). */

static void
print_variable_set (set, prefix)
register struct variable_set *set;
char *prefix;
{
register unsigned int i, nvariables, per_bucket;
register struct variable *v;

per_bucket = nvariables = 0;
for (i = 0; i < set->buckets; ++i)
{
register unsigned int this_bucket = 0;

for (v = set->table[i]; v != 0; v = v->next)
{
++this_bucket;
print_variable (v, prefix);
}

nvariables += this_bucket;
if (this_bucket > per_bucket)
per_bucket = this_bucket;
}

if (nvariables == 0)
puts ("# No variables.");
else
{
printf ("# %u variables in %u hash buckets.\n",
nvariables, set->buckets);
#ifndef NO_FLOAT
printf ("# average of %.1f variables per bucket, \
max %u in one bucket.\n",
((double) nvariables) * 100.0 / (double) set->buckets,
per_bucket);
#endif
}
}


/* Print the data base of variables. */

void
print_variable_data_base ()
{
puts ("\n# Variables\n");

print_variable_set (&global_variable_set, "");
}


/* Print all the local variables of FILE. */

void
print_file_variables (file)
struct file *file;
{
if (file->variables != 0)
print_variable_set (file->variables->set, "# ");
}

struct output_state
{
char *buffer;
unsigned int length;
};

/* Save the current variable output state and return a pointer
to storage describing it. Then reset the output state. */

char *
save_variable_output ()
{
struct output_state *state;

state = (struct output_state *) xmalloc (sizeof (struct output_state));
state->buffer = variable_buffer;
state->length = variable_buffer_length;

variable_buffer = 0;
variable_buffer_length = 0;

return (char *) state;
}

/* Restore the variable output state saved in SAVE. */

void
restore_variable_output (save)
char *save;
{
register struct output_state *state = (struct output_state *) save;

if (variable_buffer != 0)
free (variable_buffer);

variable_buffer = state->buffer;
variable_buffer_length = state->length;

free ((char *) state);
}
/* Internals of variables for GNU Make.
Copyright (C) 1988, 1989, 1990 Free Software Foundation, Inc.
This file is part of GNU Make.

GNU Make is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.

GNU Make is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Make; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */

/*
* MS-DOS port (c) 1990 by Thorsten Ohl
*
* To this port, the same copying conditions apply as to the
* original release.
*
* IMPORTANT:
* This file is not identical to the original GNU release!
* You should have received this code as patch to the official
* GNU release.
*
* MORE IMPORTANT:
* This port comes with ABSOLUTELY NO WARRANTY.
*
* $Header: e:/gnu/make/RCS/variable.c'v 3.58.0.3 90/07/20 11:27:29 tho Exp $
*/

#include "make.h"
#include "commands.h"
#include "variable.h"
#include "dep.h"
#include "file.h"

#ifdef MSDOS
#define DEFAULT_SHELL "command"
#else /* not MSDOS */
#define DEFAULT_SHELL "/bin/sh"
#endif /* not MSDOS */

#ifndef MSDOS
#ifdef __GNUC__
#define max(a, b) \
({ register int __a = (a), __b = (b); __a > __b ? __a : __b; })
#else
#define max(a, b) ((a) > (b) ? (a) : (b))
#endif
#endif /* not MSDOS */


/* Hash table of all global variable definitions. */

#ifndef VARIABLE_BUCKETS
#define VARIABLE_BUCKETS 523
#endif
#ifndef PERFILE_VARIABLE_BUCKETS
#define PERFILE_VARIABLE_BUCKETS 23
#endif
#ifndef SMALL_SCOPE_VARIABLE_BUCKETS
#define SMALL_SCOPE_VARIABLE_BUCKETS 13
#endif
static struct variable *variable_table[VARIABLE_BUCKETS];
static struct variable_set global_variable_set
= { variable_table, VARIABLE_BUCKETS };
static struct variable_set_list global_setlist
= { 0, &global_variable_set };
struct variable_set_list *current_variable_set_list = &global_setlist;

/* The next two describe the variable output buffer.
This buffer is used to hold the variable-expansion of a line of the
makefile. It is made bigger with realloc whenever it is too small.
variable_buffer_length is the size currently allocated.
variable_buffer is the address of the buffer. */

static unsigned int variable_buffer_length;
static char *variable_buffer;

#ifdef MSDOS
static struct variable *define_variable_in_set (char *name,
unsigned int length, char *value, enum variable_origin origin,
int recursive, struct variable_set *set);
static void print_variable (struct variable *v, char *prefix);
static void print_variable_set (struct variable_set *set, char *prefix);
static void merge_variable_sets (struct variable_set *set0,
struct variable_set *set1);
#endif /* MSDOS */

/* Implement variables. */

/* Define variable named NAME with value VALUE in SET. VALUE is copied.
LENGTH is the length of NAME, which does not need to be null-terminated.
ORIGIN specifies the origin of the variable (makefile, command line
or environment).
If RECURSIVE is nonzero a flag is set in the variable saying
that it should be recursively re-expanded. */

static struct variable *
define_variable_in_set (name, length, value, origin, recursive, set)
char *name;
unsigned int length;
char *value;
enum variable_origin origin;
int recursive;
struct variable_set *set;
{
register unsigned int i;
register unsigned int hashval;
register struct variable *v;

hashval = 0;
for (i = 0; i < length; ++i)
HASH (hashval, name[i]);
hashval %= set->buckets;

for (v = set->table[hashval]; v != 0; v = v->next)
if (*v->name == *name
&& !strncmp (v->name + 1, name + 1, length - 1)
&& v->name[length] == '\0')
break;

if (env_overrides && origin == o_env)
origin = o_env_override;

if (v != 0)
{
if (env_overrides && v->origin == o_env)
v->origin = o_env_override;
/* A variable of this name is already defined.
If the old definition is from a stronger source
than this one, don't redefine it. */
if ((int) origin >= (int) v->origin)
{
v->value = savestring (value, strlen (value));
v->origin = origin;
v->recursive = recursive;
}
return v;
}

/* Create a new variable definition and add it to the hash table. */

v = (struct variable *) xmalloc (sizeof (struct variable));
v->name = savestring (name, length);
v->value = savestring (value, strlen (value));
v->origin = origin;
v->recursive = recursive;
v->expanding = 0;
v->next = set->table[hashval];
set->table[hashval] = v;
return v;
}

/* Define a variable in the current variable set. */

struct variable *
define_variable (name, length, value, origin, recursive)
char *name;
unsigned int length;
char *value;
enum variable_origin origin;
int recursive;
{
return define_variable_in_set (name, length, value, origin, recursive,
current_variable_set_list->set);
}

/* Define a variable in FILE's variable set. */

struct variable *
define_variable_for_file (name, length, value, origin, recursive, file)
char *name;
unsigned int length;
char *value;
enum variable_origin origin;
int recursive;
struct file *file;
{
return define_variable_in_set (name, length, value, origin, recursive,
file->variables->set);
}

/* Lookup a variable whose name is a string starting at NAME
and with LENGTH chars. NAME need not be null-terminated.
Returns address of the `struct variable' containing all info
on the variable, or nil if no such variable is defined. */

struct variable *
lookup_variable (name, length)
char *name;
unsigned int length;
{
register struct variable_set_list *setlist;

register unsigned int i;
register unsigned int rawhash = 0;

for (i = 0; i < length; ++i)
HASH (rawhash, name[i]);

for (setlist = current_variable_set_list;
setlist != 0; setlist = setlist->next)
{
register struct variable_set *set = setlist->set;
register unsigned int hashval = rawhash % set->buckets;
register struct variable *v;

for (v = set->table[hashval]; v != 0; v = v->next)
if (*v->name == *name
&& !strncmp (v->name + 1, name + 1, length - 1)
&& v->name[length] == 0)
return v;
}

return 0;
}

/* Initialize FILE's variable set list. If FILE already has a variable set
list, the topmost variable set is left intact, but the the rest of the
chain is replaced with FILE->parent's setlist. */

void
initialize_file_variables (file)
struct file *file;
{
register struct variable_set_list *l = file->variables;
if (l == 0)
{
l = (struct variable_set_list *)
xmalloc (sizeof (struct variable_set_list));
l->set = (struct variable_set *) xmalloc (sizeof (struct variable_set));
l->set->buckets = PERFILE_VARIABLE_BUCKETS;
l->set->table = (struct variable **)
xmalloc (l->set->buckets * sizeof (struct variable *));
bzero ((char *) l->set->table,
l->set->buckets * sizeof (struct variable *));
file->variables = l;
}

if (file->parent == 0)
l->next = &global_setlist;
else
{
if (file->parent->variables == 0)
initialize_file_variables (file->parent);
l->next = file->parent->variables;
}
}

/* Pop the top set off the current variable set list,
and free all its storage. */

void
pop_variable_scope ()
{
register struct variable_set_list *setlist = current_variable_set_list;
register struct variable_set *set = setlist->set;
register unsigned int i;

current_variable_set_list = setlist->next;
free ((char *) setlist);

for (i = 0; i < set->buckets; ++i)
{
register struct variable *next = set->table[i];
while (next != 0)
{
register struct variable *v = next;
next = v->next;

free (v->name);
free ((char *) v);
}
}
free ((char *) set->table);
free ((char *) set);
}

/* Create a new variable set and push it on the current setlist. */

void
push_new_variable_scope ()
{
register struct variable_set_list *setlist;
register struct variable_set *set;

set = (struct variable_set *) xmalloc (sizeof (struct variable_set));
set->buckets = SMALL_SCOPE_VARIABLE_BUCKETS;
set->table = (struct variable **)
xmalloc (set->buckets * sizeof (struct variable *));
bzero ((char *) set->table, set->buckets * sizeof (struct variable *));

setlist = (struct variable_set_list *)
xmalloc (sizeof (struct variable_set_list));
setlist->set = set;
setlist->next = current_variable_set_list;
current_variable_set_list = setlist;
}

/* Merge SET1 into SET0, freeing unused storage in SET1. */

static void
merge_variable_sets (set0, set1)
struct variable_set *set0, *set1;
{
register unsigned int bucket1;

for (bucket1 = 0; bucket1 < set1->buckets; ++bucket1)
{
register struct variable *v1 = set1->table[bucket1];
while (v1 != 0)
{
struct variable *next = v1->next;
unsigned int bucket0;
register struct variable *v0;

if (set1->buckets >= set0->buckets)
bucket0 = bucket1;
else
{
register char *n;
bucket0 = 0;
for (n = v1->name; *n != '\0'; ++n)
HASH (bucket0, *n);
}
bucket0 %= set0->buckets;

for (v0 = set0->table[bucket0]; v0 != 0; v0 = v0->next)
if (streq (v0->name, v1->name))
break;

if (v0 == 0)
{
/* There is no variable in SET0 with the same name. */
v1->next = set0->table[bucket0];
set0->table[bucket0] = v1;
}
else
{
/* The same variable exists in both sets.
SET0 takes precedence. */
free (v1->value);
free ((char *) v1);
}

v1 = next;
}
}
}

/* Merge SETLIST1 into SETLIST0, freeing unused storage in SETLIST1. */

void
merge_variable_set_lists (setlist0, setlist1)
struct variable_set_list **setlist0, *setlist1;
{
register struct variable_set_list *list0 = *setlist0;
struct variable_set_list *last0 = 0;

while (setlist1 != 0 && list0 != 0)
{
struct variable_set_list *next = setlist1;
setlist1 = setlist1->next;

merge_variable_sets (list0->set, next->set);

free ((char *) next);

last0 = list0;
list0 = list0->next;
}

if (setlist1 != 0)
{
if (last0 == 0)
*setlist0 = setlist1;
else
last0->next = setlist1;
}
}

/* Define the automatic variables, and record the addresses
of their structures so we can change their values quickly. */

void
define_automatic_variables ()
{
register struct variable *v;
char buf[100];

sprintf (buf, "%u", makelevel);
(void) define_variable ("MAKELEVEL", 9, buf, o_env, 0);

/* This won't override any definition, but it
will provide one if there isn't one there. */
v = define_variable ("SHELL", 5, DEFAULT_SHELL, o_default, 0);

/* Don't let SHELL come from the environment
if MAKELEVEL is 0. Also, SHELL must not be empty. */
if (*v->value == '\0' || (v->origin == o_env && makelevel == 0))
{
v->origin = o_file;
v->value = savestring (DEFAULT_SHELL, 7);
}

}

/* Subroutine of variable_expand and friends:
The text to add is LENGTH chars starting at STRING to the variable_buffer.
The text is added to the buffer at PTR, and the updated pointer into
the buffer is returned as the value. Thus, the value returned by
each call to variable_buffer_output should be the first argument to
the following call. */

char *
variable_buffer_output (ptr, string, length)
char *ptr, *string;
unsigned int length;
{
register unsigned int newlen = length + (ptr - variable_buffer);

if (newlen > variable_buffer_length)
{
unsigned int offset = ptr - variable_buffer;
variable_buffer_length = max (2 * variable_buffer_length, newlen + 100);
variable_buffer = (char *) xrealloc (variable_buffer,
variable_buffer_length);
ptr = variable_buffer + offset;
}

bcopy (string, ptr, length);
return ptr + length;
}

/* Return a pointer to the beginning of the variable buffer. */

char *
initialize_variable_output ()
{
/* If we don't have a variable output buffer yet, get one. */

if (variable_buffer == 0)
{
variable_buffer_length = 200;
variable_buffer = (char *) xmalloc (variable_buffer_length);
}

return variable_buffer;
}

/* Create a new environment for FILE's commands.
The child's MAKELEVEL variable is incremented. */

char **
target_environment (file)
struct file *file;
{
register struct variable_set_list *s;
struct variable_bucket
{
struct variable_bucket *next;
struct variable *variable;
};
struct variable_bucket **table;
unsigned int buckets;
register unsigned int i;
register unsigned nvariables;
char **result;

/* Find the lowest number of buckets in any set in the list. */
s = file->variables;
buckets = s->set->buckets;
for (s = s->next; s != 0; s = s->next)
if (s->set->buckets < buckets)
buckets = s->set->buckets;

/* Temporarily allocate a table with that many buckets. */
table = (struct variable_bucket **)
alloca (buckets * sizeof (struct variable_bucket *));
bzero ((char *) table, buckets * sizeof (struct variable_bucket *));

/* Run through all the variable sets in the list,
accumulating variables in TABLE. */
nvariables = 0;
for (s = file->variables; s != 0; s = s->next)
{
register struct variable_set *set = s->set;
for (i = 0; i < set->buckets; ++i)
{
register struct variable *v;
for (v = set->table[i]; v != 0; v = v->next)
{
unsigned int j = i % buckets;
register struct variable_bucket *ov;
register char *p = v->name;

if (v->origin == o_default
|| streq (p, "MAKELEVEL"))
continue;

if (*p != '_' && (*p < 'A' || *p > 'Z')
&& (*p < 'a' || *p > 'z'))
continue;
for (++p; *p != '\0'; ++p)
if (*p != '_' && (*p < 'a' || *p > 'z')
&& (*p < 'A' || *p > 'Z') && (*p < '0' || *p > '9'))
break;
if (*p != '\0')
continue;

for (ov = table[j]; ov != 0; ov = ov->next)
if (streq (v->name, ov->variable->name))
break;
if (ov == 0)
{
register struct variable_bucket *entry;
entry = (struct variable_bucket *)
alloca (sizeof (struct variable_bucket));
entry->next = table[j];
entry->variable = v;
table[j] = entry;
++nvariables;
}
}
}
}

result = (char **) xmalloc ((nvariables + 2) * sizeof (char *));
nvariables = 0;
for (i = 0; i < buckets; ++i)
{
register struct variable_bucket *b;
for (b = table[i]; b != 0; b = b->next)
{
register struct variable *v = b->variable;
result[nvariables++] = concat (v->name, "=", v->value);
}
}
result[nvariables] = (char *) xmalloc (100);
(void) sprintf (result[nvariables], "MAKELEVEL=%u", makelevel + 1);
result[++nvariables] = 0;

return result;
}

/* Try to interpret LINE (a null-terminated string)
as a variable definition. If it is one, define the
variable and return 1. Otherwise return 0.

ORIGIN may be o_file, o_override, o_env, o_env_override,
or o_command specifying that the variable definition comes
from a makefile, an override directive, the environment with
or without the -e switch, or the command line.

A variable definition has the form "name = value" or "name := value".
Any whitespace around the "=" or ":=" is removed. The first form
defines a variable that is recursively re-evaluated. The second form
defines a variable whose value is variable-expanded at the time of
definition and then is evaluated only once at the time of expansion. */

int
try_variable_definition (line, origin)
char *line;
enum variable_origin origin;
{
register int c;
register char *p = line;
register char *beg;
register char *end;
register int recursive;

if (*p == '\t')
return 0;
while (1)
{
c = *p++;
if (c == '\0' || c == '#')
return 0;
if (c == '=')
{
recursive = 1;
break;
}
else if (c == ':')
if (*p == '=')
{
++p;
recursive = 0;
break;
}
else
return 0;
}

beg = next_token (line);
end = p - 1;
if (!recursive)
--end;
while (end[-1] == ' ' || end[-1] == '\t')
--end;
p = next_token (p);

(void) define_variable (beg, end - beg, recursive ? p : variable_expand (p),
origin, recursive);

return 1;
}

/* Print information for variable V, prefixing it with PREFIX. */

static void
print_variable (v, prefix)
register struct variable *v;
char *prefix;
{
char *origin;

switch (v->origin)
{
case o_default:
origin = "default";
break;
case o_env:
origin = "environment";
break;
case o_file:
origin = "makefile";
break;
case o_env_override:
origin = "environment under -e";
break;
case o_command:
origin = "command line";
break;
case o_override:
origin = "`override' directive";
break;
case o_automatic:
origin = "automatic";
break;
case o_invalid:
default:
abort ();
break;
}
printf ("# %s\n", origin);

fputs (prefix, stdout);

/* Is this a `define'? */
if (v->recursive && index (v->value, '\n') != 0)
printf ("define %s\n%sendef\n", v->name, v->value);
else
{
register char *p;

printf ("%s %s= ", v->name, v->recursive ? "" : ":");

/* Check if the value is just whitespace. */
p = next_token (v->value);
if (p != v->value && *p == '\0')
/* All whitespace. */
printf ("$(subst ,,%s)", v->value);
else if (v->recursive)
fputs (v->value, stdout);
else
/* Double up dollar signs. */
for (p = v->value; *p != '\0'; ++p)
{
if (*p == '$')
putchar ('$');
putchar (*p);
}
putchar ('\n');
}
}


/* Print all the variables in SET. PREFIX is printed before
the actual variable definitions (everything else is comments). */

static void
print_variable_set (set, prefix)
register struct variable_set *set;
char *prefix;
{
register unsigned int i, nvariables, per_bucket;
register struct variable *v;

per_bucket = nvariables = 0;
for (i = 0; i < set->buckets; ++i)
{
register unsigned int this_bucket = 0;

for (v = set->table[i]; v != 0; v = v->next)
{
++this_bucket;
print_variable (v, prefix);
}

nvariables += this_bucket;
if (this_bucket > per_bucket)
per_bucket = this_bucket;
}

if (nvariables == 0)
puts ("# No variables.");
else
{
printf ("# %u variables in %u hash buckets.\n",
nvariables, set->buckets);
#ifndef NO_FLOAT
printf ("# average of %.1f variables per bucket, \
max %u in one bucket.\n",
((double) nvariables) * 100.0 / (double) set->buckets,
per_bucket);
#endif
}
}


/* Print the data base of variables. */

void
print_variable_data_base ()
{
puts ("\n# Variables\n");

print_variable_set (&global_variable_set, "");
}


/* Print all the local variables of FILE. */

void
print_file_variables (file)
struct file *file;
{
if (file->variables != 0)
print_variable_set (file->variables->set, "# ");
}

struct output_state
{
char *buffer;
unsigned int length;
};

/* Save the current variable output state and return a pointer
to storage describing it. Then reset the output state. */

char *
save_variable_output ()
{
struct output_state *state;

state = (struct output_state *) xmalloc (sizeof (struct output_state));
state->buffer = variable_buffer;
state->length = variable_buffer_length;

variable_buffer = 0;
variable_buffer_length = 0;

return (char *) state;
}

/* Restore the variable output state saved in SAVE. */

void
restore_variable_output (save)
char *save;
{
register struct output_state *state = (struct output_state *) save;

if (variable_buffer != 0)
free (variable_buffer);

variable_buffer = state->buffer;
variable_buffer_length = state->length;

free ((char *) state);
}


  3 Responses to “Category : C Source Code
Archive   : OHLMAKE.ZIP
Filename : VARIABLE.C

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