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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program 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 2
* of the License, or (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "glk/adrift/scare.h"
#include "glk/adrift/scprotos.h"
#include "glk/glk.h"
#include "glk/events.h"
#include "common/debug.h"
#include "common/str.h"
#include "common/textconsole.h"
namespace Glk {
namespace Adrift {
/*
* Module notes:
*
* o Implement smarter selective module tracing.
*/
/*
* sc_trace()
*
* Debugging trace function; printf wrapper that writes to stderr.
*/
void sc_trace(const sc_char *format, ...) {
va_list ap;
assert(format);
va_start(ap, format);
Common::String s = Common::String::format(format, ap);
va_end(ap);
debug("%s", s.c_str());
}
/*
* sc_error()
* sc_fatal()
*
* Error reporting functions. sc_error() prints a message and continues.
* sc_fatal() prints a message, then calls abort().
*/
void sc_error(const sc_char *format, ...) {
va_list ap;
assert(format);
va_start(ap, format);
Common::String s = Common::String::format(format, ap);
va_end(ap);
warning("%s", s.c_str());
}
void sc_fatal(const sc_char *format, ...) {
va_list ap;
assert(format);
va_start(ap, format);
Common::String s = Common::String::format(format, ap);
va_end(ap);
error("%s", s.c_str());
}
/* Unique non-heap address for zero size malloc() and realloc() requests. */
static void *sc_zero_allocation = &sc_zero_allocation;
/*
* sc_malloc()
* sc_realloc()
* sc_free()
*
* Non-failing wrappers around malloc functions. Newly allocated memory is
* cleared to zero. In ANSI/ISO C, zero byte allocations are implementation-
* defined, so we have to take special care to get predictable behavior.
*/
void *sc_malloc(size_t size) {
void *allocated;
if (size == 0)
return sc_zero_allocation;
allocated = malloc(size);
if (!allocated)
sc_fatal("sc_malloc: requested %lu bytes\n", (sc_uint) size);
else if (allocated == sc_zero_allocation)
sc_fatal("sc_malloc: zero-byte allocation address returned\n");
memset(allocated, 0, size);
return allocated;
}
void *sc_realloc(void *pointer, size_t size) {
void *allocated;
if (size == 0) {
sc_free(pointer);
return sc_zero_allocation;
}
if (pointer == sc_zero_allocation)
pointer = NULL;
allocated = realloc(pointer, size);
if (!allocated)
sc_fatal("sc_realloc: requested %lu bytes\n", (sc_uint) size);
else if (allocated == sc_zero_allocation)
sc_fatal("sc_realloc: zero-byte allocation address returned\n");
if (!pointer)
memset(allocated, 0, size);
return allocated;
}
void sc_free(void *pointer) {
if (sc_zero_allocation != &sc_zero_allocation)
sc_fatal("sc_free: write to zero-byte allocation address detected\n");
if (pointer && pointer != sc_zero_allocation)
free(pointer);
}
/*
* sc_strncasecmp()
* sc_strcasecmp()
*
* Strncasecmp and strcasecmp are not ANSI functions, so here are local
* definitions to do the same jobs.
*/
sc_int sc_strncasecmp(const sc_char *s1, const sc_char *s2, sc_int n) {
sc_int index_;
assert(s1 && s2);
for (index_ = 0; index_ < n; index_++) {
sc_int diff;
diff = sc_tolower(s1[index_]) - sc_tolower(s2[index_]);
if (diff < 0 || diff > 0)
return diff < 0 ? -1 : 1;
}
return 0;
}
sc_int sc_strcasecmp(const sc_char *s1, const sc_char *s2) {
sc_int s1len, s2len, result;
assert(s1 && s2);
s1len = strlen(s1);
s2len = strlen(s2);
result = sc_strncasecmp(s1, s2, s1len < s2len ? s1len : s2len);
if (result < 0 || result > 0)
return result;
else
return s1len < s2len ? -1 : s1len > s2len ? 1 : 0;
}
/*
* sc_platform_rand()
* sc_congruential_rand()
* sc_set_random_handler()
*
* Internal random number generation functions. We offer two: one is a self-
* seeding wrapper around the platform's rand(), which should generate good
* random numbers but with a sequence that is platform-dependent; the other
* is a linear congruential generator with a long period that is guaranteed
* to return the same sequence for all platforms. The default is the first,
* with the latter intended for predictability of game actions.
*/
static sc_int sc_platform_rand(sc_uint new_seed) {
static sc_bool is_seeded = FALSE;
/* If reseeding, seed with the value supplied, note seeded, and return 0. */
if (new_seed > 0) {
g_vm->setRandomNumberSeed(new_seed);
is_seeded = TRUE;
return 0;
} else {
/* If not explicitly seeded yet, generate a seed from time(). */
if (!is_seeded) {
//srand ((sc_uint) time (NULL));
is_seeded = TRUE;
}
/* Return the next rand() number in the sequence. */
return g_vm->getRandomNumber(0xffffff);
}
}
static sc_int sc_congruential_rand(sc_uint new_seed) {
static sc_bool is_seeded = FALSE;
static sc_uint rand_state = 1;
/* If reseeding, seed with the value supplied, and note seeded. */
if (new_seed > 0) {
rand_state = new_seed;
is_seeded = TRUE;
return 0;
} else {
/* If not explicitly seeded yet, generate a seed from time(). */
if (!is_seeded) {
rand_state = (sc_uint)g_vm->_events->getTotalPlayTicks();
is_seeded = TRUE;
}
/*
* Advance random state, using constants from Park & Miller (1988).
* To keep the values the same for both 32 and 64 bit longs, mask out
* any bits above the bottom 32.
*/
rand_state = (rand_state * 16807 + 2147483647) & 0xffffffff;
/*
* Discard the lowest bit as a way to map 32-bits unsigned to a 32-bit
* positive signed.
*/
return rand_state >> 1;
}
}
/* Function pointer for the actual random number generator in use. */
static sc_int(*sc_rand_function)(sc_uint) = sc_platform_rand;
/*
* sc_set_congruential_random()
* sc_set_platform_random()
* sc_is_congruential_random()
* sc_seed_random()
* sc_rand()
* sc_randomint()
*
* Public interface to random functions; control and reseed the random
* handler in use, generate a random number, and a convenience function to
* generate a random value within a given range.
*/
void sc_set_congruential_random(void) {
sc_rand_function = sc_congruential_rand;
}
void sc_set_platform_random(void) {
sc_rand_function = sc_platform_rand;
}
sc_bool sc_is_congruential_random(void) {
return sc_rand_function == sc_congruential_rand;
}
void sc_seed_random(sc_uint new_seed) {
/* Ignore zero values of new_seed by simply using 1 instead. */
sc_rand_function(new_seed > 0 ? new_seed : 1);
}
sc_int sc_rand(void) {
sc_int retval;
/* Passing zero indicates this is not a seed operation. */
retval = sc_rand_function(0);
return retval;
}
sc_int sc_randomint(sc_int low, sc_int high) {
/*
* If the range is invalid, just return the low value given. This mimics
* Adrift under the same conditions, and also guards against division by
* zero in the mod operation.
*/
return (high < low) ? low : low + sc_rand() % (high - low + 1);
}
/* Miscellaneous general ascii constants. */
static const sc_char NUL = '\0';
static const sc_char SPACE = ' ';
/*
* sc_strempty()
*
* Return TRUE if a string is either zero-length or contains only whitespace.
*/
sc_bool sc_strempty(const sc_char *string) {
sc_int index_;
assert(string);
/* Scan for any non-space character. */
for (index_ = 0; string[index_] != NUL; index_++) {
if (!sc_isspace(string[index_]))
return FALSE;
}
/* None found, so string is empty. */
return TRUE;
}
/*
* sc_trim_string()
*
* Trim leading and trailing whitespace from a string. Modifies the string
* in place, and returns the string address for convenience.
*/
sc_char *sc_trim_string(sc_char *string) {
sc_int index_;
assert(string);
for (index_ = strlen(string) - 1;
index_ >= 0 && sc_isspace(string[index_]); index_--)
string[index_] = NUL;
for (index_ = 0; sc_isspace(string[index_]);)
index_++;
memmove(string, string + index_, strlen(string) - index_ + 1);
return string;
}
/*
* sc_normalize_string()
*
* Trim a string, and set all runs of whitespace to a single space character.
* Modifies the string in place, and returns the string address for
* convenience.
*/
sc_char *sc_normalize_string(sc_char *string) {
sc_int index_;
assert(string);
/* Trim all leading and trailing spaces. */
string = sc_trim_string(string);
/* Compress multiple whitespace runs into a single space character. */
for (index_ = 0; string[index_] != NUL; index_++) {
if (sc_isspace(string[index_])) {
sc_int cursor;
string[index_] = SPACE;
for (cursor = index_ + 1; sc_isspace(string[cursor]);)
cursor++;
memmove(string + index_ + 1,
string + cursor, strlen(string + cursor) + 1);
}
}
return string;
}
/*
* sc_compare_word()
*
* Return TRUE if the first word in the string is word, case insensitive.
*/
sc_bool sc_compare_word(const sc_char *string, const sc_char *word, sc_int length) {
assert(string && word);
/* Return TRUE if string starts with word, then space or string end. */
return sc_strncasecmp(string, word, length) == 0
&& (string[length] == NUL || sc_isspace(string[length]));
}
/*
* sc_hash()
*
* Hash a string, hashpjw algorithm, from 'Compilers, principles, techniques,
* and tools', page 436, unmodulo'ed and somewhat restyled.
*/
sc_uint sc_hash(const sc_char *string) {
sc_int index_;
sc_uint hash;
assert(string);
hash = 0;
for (index_ = 0; string[index_] != NUL; index_++) {
sc_uint temp;
hash = (hash << 4) + string[index_];
temp = hash & 0xf0000000;
if (temp != 0) {
hash = hash ^ (temp >> 24);
hash = hash ^ temp;
}
}
return hash;
}
} // End of namespace Adrift
} // End of namespace Glk
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