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SeGeneric.c
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SeGeneric.c
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/*
* This file is part of the Seyon, Copyright (c) 1992-1993 by Muhammad M.
* Saggaf. All rights reserved.
*
* See the file COPYING (1-COPYING) or the manual page seyon(1) for a full
* statement of rights and permissions for this program.
*/
#include "config.h"
#include <stdio.h>
#ifndef NOSTDHDRS
#include <stdlib.h>
#endif
#include <unistd.h>
#include <signal.h>
#include <setjmp.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/time.h>
#include <ctype.h>
#include <math.h>
#include "SeDecl.h"
void
ReadCommentedFile(fp, line)
FILE *fp;
char *line[];
{
char buffer[REG_BUF + 1],
*bufPtr,
*ptr;
int i;
for (i = 0; i < MAX_ENT && fgets(buffer, REG_BUF, fp) != NULL;) {
/*Strip newline character from end of string*/
buffer[strlen(buffer) - 1] = '\0';
/*Remove leading and trailing spaces*/
bufPtr = SSpc(buffer);
/*Ignore this line if it is empty or starts with a comment*/
if (bufPtr[0] == '\0' || bufPtr[0] == '#')
continue;
/*Ignore trailing comments*/
if ((ptr = (char *) strrchr(bufPtr, '#')) != NULL)
*ptr = '\0';
line[i++] = XtNewString(bufPtr);
}
line[i] = NULL;
}
void
FreeList(listArr)
XtPointer listArr[];
{
int i;
for (i = 0; listArr[i]; i++)
XtFree(listArr[i]);
listArr[0] = NULL;
}
int
ConvertStringToIntArray(str, intArr)
char *str;
int intArr[];
{
char num[TIN_BUF], *numPtr;
int i;
intArr[0] = 0;
if (!str) return 0;
for (i = 0;;) {
while (isspace(*str)) str++;
if (!*str) return 0;
for (numPtr = num; *str && !isspace(*str); *numPtr++ = *str++);
*numPtr = '\0';
intArr[i] = atoi(num);
intArr[++i] = 0;
}
}
/* ------------------------------------------------------------
* Routines to read from the tty.
*/
/*
* TtyReadStr: reads a bunch of characters from the modem.
*/
int
TtyReadStr(fd, buf)
int fd;
char *buf;
{
int count;
/* The do-loop is used to restart the system call if it is interrupted by
a signal. This is simpler than missing with SA_INTERRUPT */
do
/* BUFSIZ is defined in stdio.h */
count = read(fd, buf, BUFSIZ);
while (count < 0 && errno == EINTR);
if (count < 0) {
SePError("character read");
return -1;
}
return count;
}
jmp_buf timedReadEnv;
void
timedReadAlarmHandler(dummy)
int dummy;
{
longjmp(timedReadEnv, 1);
}
int
TtyTimedReadChar(fd, readChar, expireTime)
int fd;
char *readChar;
int expireTime;
{
/* BUFSIZ is defined in stdio.h */
static char readBuf[BUFSIZ],
*bufPtr;
static int count = 0;
static void (*oldSigHandler)();
static unsigned oldAlarmTimeLeft;
if (count > 0) {
count--;
*readChar = *++bufPtr;
return 0;
}
if (expireTime > 0) {
oldSigHandler = signal(SIGALRM, timedReadAlarmHandler);
oldAlarmTimeLeft = alarm((unsigned)expireTime);
if (setjmp(timedReadEnv) != 0) {
alarm(max(oldAlarmTimeLeft - expireTime, 0));
signal(SIGALRM, oldSigHandler);
return -1;
}
}
count = TtyReadStr(fd, (bufPtr = readBuf));
if (expireTime > 0) {
alarm(max(oldAlarmTimeLeft - expireTime + alarm(0), 0));
signal(SIGALRM, oldSigHandler);
}
if (count < 0) return count;
count--;
*readChar = *bufPtr;
return 0;
}
/*
* TtyReadChar: reads one character from the tty.
*/
char
TtyReadChar(fd, readChar)
int fd;
char *readChar;
{
return TtyTimedReadChar(fd, readChar, 0);
}
/*---------------------------------------------------------------------------+
| TtyReadLine - reads one line from the tty.
+---------------------------------------------------------------------------*/
int
TtyReadLine(fd, buf)
int fd;
char *buf;
{
char c;
int i, readCharRet;
while ((readCharRet = TtyReadChar(fd, &c)) >= 0 && (c == '\r' || c == '\n'));
if (readCharRet < 0) return readCharRet;
i = 0;
do buf[i++] = c;
while ((readCharRet = TtyReadChar(fd, &c)) >=0 && (c != '\r' && c != '\n'));
buf[i] = '\0';
return readCharRet;
}
int
TtyTimedWaitFor(fd, expectedString, waitTime)
int fd;
char *expectedString;
int waitTime;
{
time_t expireTime;
char c, *ptr = expectedString;
expireTime = time((time_t*)0) + waitTime;
while (expireTime != time((time_t*)0)) {
if ((TtyTimedReadChar(fd, &c, 1)) < 0)
continue;
if ((char)c != *ptr) ptr = expectedString;
else if (*++ptr == '\0') return 0;
} /* while... */
return -1;
}
/* ------------------------------------------------------------
* Miscellaneous routines.
*/
/*
* usleep: for systems that do not have it.
*/
#if !HAVE_USLEEP
void
usleep(usec)
unsigned long usec;
{
#if HAVE_SELECT
/* Orest Zborowski originally wrote this */
struct timeval timeout;
timeout.tv_sec = usec / 1000000;
timeout.tv_usec = usec - 1000000 * timeout.tv_sec;
select(1, NULL, NULL, NULL, &timeout);
#else
/* This busy-waiting, normally a bad idea on a multi-tasking system, is used
because sleep(1) is way too much of a delay. */
int i;
for (i = 0; i < usec; i++);
#endif /* HAVE_SELECT */
}
#endif /* HAVE_USLEEP */
/*
* dup2: for systems that do not have it.
*/
#if !HAVE_DUP2
int
dup2(oldfd, newfd)
int oldfd,
newfd;
{
if (fcntl(oldfd, F_GETFL, 0) == -1) /* Valid file descriptor? */
return (-1); /* No, return an error. */
close(newfd); /* Ensure newfd is closed */
return (fcntl(oldfd, F_DUPFD, newfd)); /* Dup oldfd into newfd */
}
#endif /* HAVE_DUP2 Thanks to Bill Allie CIS: 76703,2061 */