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simh-testsetgenerator/sim_frontpanel.c

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/* sim_frontpanel.c: simulator frontpanel API
Copyright (c) 2015, Mark Pizzolato
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
MARK PIZZOLATO BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of Mark Pizzolato shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from Mark Pizzolato.
05-Feb-15 MP Initial implementation
This module provides interface between a front panel application and a simh
simulator. Facilities provide ways to gather information from and to
observe and control the state of a simulator.
*/
#include "sim_frontpanel.h"
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <errno.h>
#include <signal.h>
#include <pthread.h>
#if defined(_WIN32)
#include <process.h>
#define sleep(n) Sleep(n*1000)
#define msleep(n) Sleep(n)
#define strtoull _strtoui64
#else
#include <unistd.h>
#define msleep(n) usleep(1000*n)
#include <sys/wait.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif
#include "sim_sock.h"
typedef struct {
char *name;
void *addr;
size_t size;
} REG;
struct sim_frontpanel {
char *path;
char *config;
char *temp_config;
char hostport[64];
SOCKET sock;
int reg_count;
REG *regs;
OperationalState State;
pthread_mutex_t lock;
pthread_t io_thread;
int io_thread_running;
pthread_mutex_t io_lock;
pthread_mutex_t io_send_lock;
pthread_cond_t io_done;
pthread_cond_t startup_cond;
PANEL_DISPLAY_PCALLBACK callback;
pthread_t callback_thread;
int callback_thread_running;
void *callback_context;
int callbacks_per_second;
#if defined(_WIN32)
HANDLE hProcess;
#else
pid_t pidProcess;
#endif
};
static char *sim_prompt = "sim> ";
static int little_endian;
static void *_panel_reader(void *arg);
static void *_panel_callback(void *arg);
#define TN_IAC 0xFFu /* -1 */ /* protocol delim */
#define TN_DONT 0xFEu /* -2 */ /* dont */
#define TN_DO 0xFDu /* -3 */ /* do */
#define TN_WONT 0xFCu /* -4 */ /* wont */
#define TN_WILL 0xFBu /* -5 */ /* will */
#define TN_BIN 0 /* bin */
#define TN_ECHO 1 /* echo */
#define TN_SGA 3 /* sga */
#define TN_LINE 34 /* line mode */
static unsigned char mantra[] = {
TN_IAC, TN_WILL, TN_LINE,
TN_IAC, TN_WILL, TN_SGA,
TN_IAC, TN_WILL, TN_ECHO,
TN_IAC, TN_WILL, TN_BIN,
TN_IAC, TN_DO, TN_BIN
};
static void *
_panel_malloc (size_t size)
{
void *p = malloc (size);
if (p == NULL)
sim_panel_set_error ("Out of Memory");
return p;
}
static int
_panel_send (PANEL *p, const char *msg, int len)
{
int sent = 0;
if (p->sock == INVALID_SOCKET) {
sim_panel_set_error ("Invalid Socket for write");
return -1;
}
pthread_mutex_lock (&p->io_send_lock);
while (len) {
int bsent = sim_write_sock (p->sock, msg, len);
if (bsent < 0) {
sim_panel_set_error ("%s", sim_get_err_sock("Error writing to socket"));
pthread_mutex_unlock (&p->io_send_lock);
return bsent;
}
len -= bsent;
msg += bsent;
sent += bsent;
}
pthread_mutex_unlock (&p->io_send_lock);
return sent;
}
static int
_panel_sendf (PANEL *p, const char *fmt, ...);
static int
_panel_register_query_string (PANEL *panel, char **buf, int *buf_size)
{
int i, buf_data, buf_needed = 0;
for (i=0; i<panel->reg_count; i++)
buf_needed += 7 + strlen (panel->regs[i].name);
buf_needed += 20; /* # REGISTERS-DONE */
if (buf_needed > *buf_size) {
free (*buf);
*buf = (char *)_panel_malloc (buf_needed);
if (!*buf)
return -1;
*buf_size = buf_needed;
}
buf_data = 0;
#if SEPARATE_REGISTERS
for (i=0; i<panel->reg_count; i++) {
sprintf (*buf + buf_data, "E -H %s\r", panel->regs[i].name);
buf_data += strlen (*buf + buf_data);
}
#else
sprintf (*buf + buf_data, "E -H ");
buf_data += strlen (*buf + buf_data);
for (i=0; i<panel->reg_count; i++) {
sprintf (*buf + buf_data, "%s%s", (i>0) ? "," : "", panel->regs[i].name);
buf_data += strlen (*buf + buf_data);
}
sprintf (*buf + buf_data, "\r");
buf_data += strlen (*buf + buf_data);
#endif
sprintf (*buf + buf_data, "# REGISTERS-DONE\r");
buf_data += strlen (*buf + buf_data);
*buf_size = buf_data;
return 0;
}
static PANEL **panels = NULL;
static int panel_count = 0;
static void
_panel_cleanup (void)
{
while (panel_count)
sim_panel_stop_simulator (*panels);
}
static void
_panel_register_panel (PANEL *p)
{
++panel_count;
panels = realloc (panels, sizeof(*panels)*panel_count);
panels[panel_count-1] = p;
if (panel_count == 1)
atexit (&_panel_cleanup);
}
static void
_panel_deregister_panel (PANEL *p)
{
int i;
for (i=0; i<panel_count; i++) {
if (panels[i] == p) {
int j;
for (j=i+1; j<panel_count; j++)
panels[j-1] = panels[j];
--panel_count;
if (panel_count == 0) {
free (panels);
panels = NULL;
}
break;
}
}
}
PANEL *
sim_panel_start_simulator (const char *sim_path,
const char *sim_config)
{
PANEL *p = NULL;
FILE *f = NULL;
struct stat statb;
char *buf = NULL;
int port;
char hostport[64];
union {int i; char c[sizeof (int)]; } end_test;
end_test.i = 1; /* test endian-ness */
little_endian = (end_test.c[0] != 0);
sim_init_sock ();
for (port=1024; port < 2048; port++) {
SOCKET sock;
sprintf (hostport, "%d", port);
sock = sim_connect_sock_ex (NULL, hostport, NULL, NULL, SIM_SOCK_OPT_NODELAY | SIM_SOCK_OPT_BLOCKING);
if (sock != INVALID_SOCKET) {
int sta = 0;
while (!sta) {
msleep (10);
sta = sim_check_conn (sock, 1);
}
sim_close_sock (sock);
if (sta == -1)
break;
}
else
break;
}
if (stat (sim_path, &statb) < 0) {
sim_panel_set_error ("Can't stat simulator '%s': %s", sim_path, strerror(errno));
goto Error_Return;
}
if (stat (sim_config, &statb) < 0) {
sim_panel_set_error ("Can't stat simulator configuration '%s': %s", sim_config, strerror(errno));
goto Error_Return;
}
f = fopen (sim_config, "rb");
if (NULL == f) {
sim_panel_set_error ("Can't open simulator configuration '%s': %s", sim_config, strerror(errno));
goto Error_Return;
}
buf = (char *)_panel_malloc (statb.st_size+1);
if (buf == NULL)
goto Error_Return;
buf[statb.st_size] = '\0';
p = (PANEL *)_panel_malloc (sizeof(*p));
if (p == NULL)
goto Error_Return;
memset (p, 0, sizeof(*p));
p->sock = INVALID_SOCKET;
p->path = (char *)_panel_malloc (strlen (sim_path) + 1);
if (p->path == NULL)
goto Error_Return;
strcpy (p->path, sim_path);
p->config = (char *)_panel_malloc (strlen (sim_config) + 1);
if (p->config == NULL)
goto Error_Return;
strcpy (p->config, sim_config);
f = fopen (sim_config, "rb");
if (f == NULL) {
sim_panel_set_error ("Can't open configuration file '%s': %s", sim_config, strerror(errno));
goto Error_Return;
}
if (statb.st_size != fread (buf, 1, statb.st_size, f)) {
sim_panel_set_error ("Can't read complete configuration file '%s': %s", sim_config, strerror(errno));
goto Error_Return;
}
fclose (f);
f = NULL;
p->temp_config = (char *)_panel_malloc (strlen (sim_config) + 40);
if (p->temp_config == NULL)
goto Error_Return;
sprintf (p->temp_config, "%s-Panel-%d", sim_config, getpid());
f = fopen (p->temp_config, "w");
if (f == NULL) {
sim_panel_set_error ("Can't create temporary configuration file '%s': %s", p->temp_config, strerror(errno));
goto Error_Return;
}
fprintf (f, "# Temporary FrontPanel generated simh configuration file\n");
fprintf (f, "# Original Configuration File: %s\n", p->config);
fprintf (f, "# Simulator Path: %s\n", p->path);
fprintf (f, "%s\n", buf);
free (buf);
buf = NULL;
fprintf (f, "set remote telnet=%s\n", hostport);
fprintf (f, "set remote master\n");
fclose (f);
f = NULL;
if (1) {
#if defined(_WIN32)
char cmd[1024];
sprintf(cmd, "%s%s%s %s%s%s", strchr (p->path, ' ') ? "\"" : "", p->path, strchr (p->path, ' ') ? "\"" : "", strchr (p->temp_config, ' ') ? "\"" : "", p->temp_config, strchr (p->temp_config, ' ') ? "\"" : "");
if (1) {
PROCESS_INFORMATION ProcessInfo;
STARTUPINFO StartupInfo;
memset (&ProcessInfo, 0, sizeof(ProcessInfo));
memset (&StartupInfo, 0, sizeof(StartupInfo));
StartupInfo.dwFlags = STARTF_USESTDHANDLES;
StartupInfo.hStdInput = INVALID_HANDLE_VALUE;
StartupInfo.hStdOutput = INVALID_HANDLE_VALUE;
StartupInfo.hStdError = INVALID_HANDLE_VALUE;
if (CreateProcessA(p->path, cmd, NULL, NULL, FALSE, CREATE_NO_WINDOW, NULL, NULL, &StartupInfo, &ProcessInfo)) {
CloseHandle (ProcessInfo.hThread);
p->hProcess = ProcessInfo.hProcess;
Sleep (500);
}
else { /* Creation Problem */
sim_panel_set_error ("CreateProcess Error: %d", GetLastError());
goto Error_Return;
}
}
#else
p->pidProcess = fork();
if (p->pidProcess == 0) {
close (0);
close (1);
close (2);
if (execl (p->path, p->path, p->temp_config, NULL)) {
perror ("execl");
exit(errno);
}
}
if (p->pidProcess < 0) {
p->pidProcess = 0;
sim_panel_set_error ("vfork() Error: %s", strerror(errno));
goto Error_Return;
}
msleep (500);
#endif
}
p->sock = sim_connect_sock_ex (NULL, hostport, NULL, NULL, SIM_SOCK_OPT_NODELAY | SIM_SOCK_OPT_BLOCKING);
if (p->sock == INVALID_SOCKET) {
sim_panel_set_error ("Can't connect to simulator Remote Console on port %s", hostport);
goto Error_Return;
}
if (1) {
pthread_attr_t attr;
pthread_mutex_init (&p->io_lock, NULL);
pthread_mutex_init (&p->io_send_lock, NULL);
pthread_cond_init (&p->io_done, NULL);
pthread_cond_init (&p->startup_cond, NULL);
pthread_attr_init(&attr);
pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM);
pthread_mutex_lock (&p->io_lock);
pthread_create (&p->io_thread, &attr, _panel_reader, (void *)p);
pthread_attr_destroy(&attr);
while (!p->io_thread_running)
pthread_cond_wait (&p->startup_cond, &p->io_lock); /* Wait for thread to stabilize */
pthread_mutex_unlock (&p->io_lock);
pthread_cond_destroy (&p->startup_cond);
}
if (sizeof(mantra) != _panel_send (p, (char *)mantra, sizeof(mantra))) {
sim_panel_set_error ("Error sending Telnet mantra (options): %s", sim_get_err_sock ("send"));
goto Error_Return;
}
_panel_register_panel (p);
return p;
Error_Return:
if (f)
fclose (f);
if (buf)
free (buf);
sim_panel_stop_simulator (p);
return NULL;
}
int
sim_panel_stop_simulator (PANEL *panel)
{
REG *reg;
if (panel) {
_panel_deregister_panel (panel);
free (panel->path);
free (panel->config);
if (panel->sock != INVALID_SOCKET) {
SOCKET sock = panel->sock;
int wait_count;
/* First, wind down the automatic register queries */
sim_panel_set_display_callback (panel, NULL, NULL, 0);
/* Next, attempt a simulator shutdown */
_panel_send (panel, "\005\rEXIT\r", 7);
/* Wait for up to 2 seconds for a graceful shutdown */
for (wait_count=0; panel->io_thread_running && (wait_count<20); ++wait_count)
msleep (100);
/* Now close the socket which should stop a pending read which hasn't completed */
panel->sock = INVALID_SOCKET;
sim_close_sock (sock);
pthread_join (panel->io_thread, NULL);
pthread_mutex_destroy (&panel->io_lock);
pthread_mutex_destroy (&panel->io_send_lock);
pthread_cond_destroy (&panel->io_done);
}
#if defined(_WIN32)
if (panel->hProcess) {
TerminateProcess (panel->hProcess, 0);
WaitForSingleObject (panel->hProcess, INFINITE);
CloseHandle (panel->hProcess);
}
#else
if (panel->pidProcess) {
int status;
if (!kill (panel->pidProcess, 0)) {
kill (panel->pidProcess, SIGTERM);
msleep (200);
if (!kill (panel->pidProcess, 0))
kill (panel->pidProcess, SIGKILL);
}
waitpid (panel->pidProcess, &status, 0);
}
#endif
if (panel->temp_config)
remove (panel->temp_config);
free (panel->temp_config);
reg = panel->regs;
while (panel->reg_count--) {
free (reg->name);
reg++;
}
free (panel->regs);
}
sim_cleanup_sock ();
free (panel);
return 0;
}
OperationalState
sim_panel_get_state (PANEL *panel)
{
if (!panel) {
sim_panel_set_error ("Invalid Panel");
return -1;
}
return panel->State;
}
int
sim_panel_add_register (PANEL *panel,
const char *name,
size_t size,
void *addr)
{
REG *regs, *reg;
if (!panel) {
sim_panel_set_error ("Invalid Panel");
return -1;
}
regs = (REG *)_panel_malloc ((1 + panel->reg_count)*sizeof(*regs));
if (regs == NULL)
return -1;
memcpy (regs, panel->regs, panel->reg_count*sizeof(*regs));
reg = &regs[panel->reg_count];
memset (reg, 0, sizeof(*regs));
reg->name = (char *)_panel_malloc (1 + strlen (name));
if (reg->name == NULL) {
free (regs);
return -1;
}
strcpy (reg->name, name);
reg->addr = addr;
reg->size = size;
++panel->reg_count;
free (panel->regs);
panel->regs = regs;
return 0;
}
int
sim_panel_get_registers (PANEL *panel)
{
char *buf = NULL;
int buf_data;
if (!panel) {
sim_panel_set_error ("Invalid Panel");
return -1;
}
if (panel->callback) {
sim_panel_set_error ("Callback provides register data");
return -1;
}
buf_data = 0;
if (_panel_register_query_string (panel, &buf, &buf_data))
return -1;
pthread_mutex_lock (&panel->io_lock);
if (buf_data != _panel_send (panel, buf, buf_data))
return -1;
pthread_cond_wait (&panel->io_done, &panel->io_lock);
pthread_mutex_unlock (&panel->io_lock);
return 0;
}
int
sim_panel_set_display_callback (PANEL *panel,
PANEL_DISPLAY_PCALLBACK callback,
void *context,
int callbacks_per_second)
{
if (!panel) {
sim_panel_set_error ("Invalid Panel");
return -1;
}
pthread_mutex_lock (&panel->io_lock);
panel->callback = callback;
panel->callback_context = context;
if (callbacks_per_second && (0 == panel->callbacks_per_second)) { /* Need to start callbacks */
pthread_attr_t attr;
panel->callbacks_per_second = callbacks_per_second;
pthread_cond_init (&panel->startup_cond, NULL);
pthread_attr_init(&attr);
pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM);
pthread_create (&panel->callback_thread, &attr, _panel_callback, (void *)panel);
pthread_attr_destroy(&attr);
while (!panel->callback_thread_running)
pthread_cond_wait (&panel->startup_cond, &panel->io_lock); /* Wait for thread to stabilize */
pthread_cond_destroy (&panel->startup_cond);
}
if ((callbacks_per_second == 0) && panel->callbacks_per_second) { /* Need to stop callbacks */
panel->callbacks_per_second = 0;
pthread_mutex_unlock (&panel->io_lock);
pthread_join (panel->callback_thread, NULL);
pthread_mutex_lock (&panel->io_lock);
}
pthread_mutex_unlock (&panel->io_lock);
return 0;
}
int
sim_panel_exec_halt (PANEL *panel)
{
if (!panel) {
sim_panel_set_error ("Invalid Panel");
return -1;
}
if (panel->State == Run) {
if (1 != _panel_send (panel, "\005", 1))
return -1;
}
return 0;
}
int
sim_panel_exec_boot (PANEL *panel, const char *device)
{
if (!panel) {
sim_panel_set_error ("Invalid Panel");
return -1;
}
if (panel->State == Run) {
sim_panel_set_error ("Not Halted");
return -1;
}
if (_panel_sendf (panel, "BOOT %s\r", device))
return -1;
panel->State = Run;
return 0;
}
int
sim_panel_exec_run (PANEL *panel)
{
if (!panel) {
sim_panel_set_error ("Invalid Panel");
return -1;
}
if (panel->State == Run) {
sim_panel_set_error ("Not Halted");
return -1;
}
if (5 != _panel_send (panel, "CONT\r", 5))
return -1;
panel->State = Run;
return 0;
}
int
sim_panel_exec_step (PANEL *panel)
{
if (!panel) {
sim_panel_set_error ("Invalid Panel");
return -1;
}
if (panel->State == Run) {
sim_panel_set_error ("Not Halted");
return -1;
}
if (5 != _panel_send (panel, "STEP\r", 5))
return -1;
panel->State = Run;
return 0;
}
static void *
_panel_reader(void *arg)
{
PANEL *p = (PANEL*)arg;
int sched_policy;
struct sched_param sched_priority;
char buf[4096];
int buf_data = 0;
/*
Boost Priority for this response processing thread to quickly digest
arriving data.
*/
pthread_getschedparam (pthread_self(), &sched_policy, &sched_priority);
++sched_priority.sched_priority;
pthread_setschedparam (pthread_self(), sched_policy, &sched_priority);
pthread_mutex_lock (&p->io_lock);
p->io_thread_running = 1;
pthread_cond_signal (&p->startup_cond); /* Signal we're ready to go */
while (p->sock != INVALID_SOCKET) {
int new_data;
char *s, *e, *eol;
pthread_mutex_unlock (&p->io_lock);
new_data = sim_read_sock (p->sock, &buf[buf_data], sizeof(buf)-(buf_data+1));
if (new_data <= 0)
break;
buf_data += new_data;
buf[buf_data] = '\0';
s = buf;
while ((eol = strchr (s, '\r'))) {
/* Line to process */
*eol++ = '\0';
e = strchr (s, ':');
if (e) {
int i;
*e++ = '\0';
for (i=0; i<p->reg_count; i++) {
if (!strcmp(p->regs[i].name, s)) {
unsigned long long data;
data = strtoull (e, NULL, 16);
if (little_endian)
memcpy (p->regs[i].addr, &data, p->regs[i].size);
else
memcpy (p->regs[i].addr, ((char *)&data) + sizeof(data)-p->regs[i].size, p->regs[i].size);
break;
}
}
if (i == p->reg_count) {
/* Unexpected Register Data Found */
}
}
else {
if (!strcmp (s + strlen (sim_prompt), "# REGISTERS-DONE"))
if (p->callback) {
p->callback (p, p->callback_context);
}
else {
pthread_mutex_lock (&p->io_lock);
pthread_cond_signal (&p->io_done);
pthread_mutex_unlock (&p->io_lock);
}
else {
/* Non Register Data Found (echo of EXAMINE or other commands) */
}
}
s = eol;
while (isspace(*s))
++s;
}
pthread_mutex_lock (&p->io_lock);
if ((p->State == Run) && (!strcmp (s, sim_prompt))) {
p->State = Halt;
}
memmove (buf, s, strlen (s)+1);
buf_data = strlen (buf);
if (!strcmp("Simulator Running", buf)) {
p->State = Run;
buf_data = 0;
buf[0] = '\0';
}
}
p->io_thread_running = 0;
pthread_mutex_unlock (&p->io_lock);
return NULL;
}
static void *
_panel_callback(void *arg)
{
PANEL *p = (PANEL*)arg;
int sched_policy;
struct sched_param sched_priority;
char *buf = NULL;
int buf_data = 0;
unsigned int callback_count = 0;
/*
Boost Priority for timer thread so it doesn't compete
with compute bound activities.
*/
pthread_getschedparam (pthread_self(), &sched_policy, &sched_priority);
++sched_priority.sched_priority;
pthread_setschedparam (pthread_self(), sched_policy, &sched_priority);
pthread_mutex_lock (&p->io_lock);
p->callback_thread_running = 1;
pthread_cond_signal (&p->startup_cond); /* Signal we're ready to go */
while ((p->sock != INVALID_SOCKET) &&
(p->callbacks_per_second)) {
int rate = p->callbacks_per_second;
pthread_mutex_unlock (&p->io_lock);
++callback_count;
if (1 == callback_count%rate)
_panel_register_query_string (p, &buf, &buf_data);
msleep (1000/rate);
if ((p->State == Run) || (0 == callback_count%(5*rate)))
if (buf_data != _panel_send (p, buf, buf_data)) {
break;
}
pthread_mutex_lock (&p->io_lock);
}
p->callback_thread_running = 0;
pthread_mutex_unlock (&p->io_lock);
free (buf);
return NULL;
}
static char *sim_panel_error_buf = NULL;
static size_t sim_panel_error_bufsize = 0;
const char *sim_panel_get_error (void)
{
return (sim_panel_error_buf ? sim_panel_error_buf : "");
}
void sim_panel_clear_error (void)
{
if (sim_panel_error_bufsize)
free (sim_panel_error_buf);
sim_panel_error_buf = NULL;
sim_panel_error_bufsize = 0;
}
#if defined (_WIN32)
#define vsnprintf _vsnprintf
#endif
void sim_panel_set_error (const char *fmt, ...)
{
va_list arglist;
int len;
if (sim_panel_error_bufsize == 0) {
sim_panel_error_bufsize = 2048;
sim_panel_error_buf = (char *) malloc (sim_panel_error_bufsize);
if (sim_panel_error_buf == NULL) { /* out of memory */
sim_panel_error_buf = "sim_panel_set_error(): Out of Memory\n";
sim_panel_error_bufsize = 0;
return;
}
}
sim_panel_error_buf[sim_panel_error_bufsize-1] = '\0';
while (1) { /* format passed string, args */
va_start (arglist, fmt);
len = vsnprintf (sim_panel_error_buf, sim_panel_error_bufsize-1, fmt, arglist);
va_end (arglist);
/* If the formatted result didn't fit into the buffer, then grow the buffer and try again */
if ((len < 0) || (len >= (int)(sim_panel_error_bufsize-1))) {
free (sim_panel_error_buf);
sim_panel_error_bufsize = sim_panel_error_bufsize * 2;
while ((int)sim_panel_error_bufsize < len + 1)
sim_panel_error_bufsize = sim_panel_error_bufsize * 2;
sim_panel_error_buf = (char *) malloc (sim_panel_error_bufsize);
if (sim_panel_error_buf == NULL) { /* out of memory */
sim_panel_error_buf = "sim_panel_set_error(): Out of Memory\n";
sim_panel_error_bufsize = 0;
return;
}
sim_panel_error_buf[sim_panel_error_bufsize-1] = '\0';
continue;
}
break;
}
return;
}
static int
_panel_sendf (PANEL *p, const char *fmt, ...)
{
char stackbuf[1024];
int bufsize = sizeof(stackbuf);
char *buf = stackbuf;
int len;
va_list arglist;
int ret;
while (1) { /* format passed string, args */
va_start (arglist, fmt);
len = vsnprintf (buf, bufsize-1, fmt, arglist);
va_end (arglist);
/* If the formatted result didn't fit into the buffer, then grow the buffer and try again */
if ((len < 0) || (len >= bufsize-1)) {
if (buf != stackbuf)
free (buf);
bufsize = bufsize * 2;
buf = (char *) _panel_malloc (bufsize);
if (buf == NULL) /* out of memory */
return -1;
buf[bufsize-1] = '\0';
continue;
}
break;
}
ret = (strlen (buf) == _panel_send (p, buf, strlen (buf))) ? 0 : -1;
if (buf != stackbuf)
free (buf);
return ret;
}
#ifdef __cplusplus
}
#endif
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