mspdebug/util.c

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5.8 KiB
C
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/* MSPDebug - debugging tool for MSP430 MCUs
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* Copyright (C) 2009, 2010 Daniel Beer
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
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#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>
#include <unistd.h>
#include <errno.h>
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#include <signal.h>
#include <assert.h>
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#include "util.h"
#include "output.h"
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static volatile int ctrlc_flag;
static void sigint_handler(int signum)
{
ctrlc_flag = 1;
}
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void ctrlc_init(void)
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{
#ifdef WIN32
signal(SIGINT, sigint_handler);
#else
const static struct sigaction siga = {
.sa_handler = sigint_handler,
.sa_flags = 0
};
sigaction(SIGINT, &siga, NULL);
#endif
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}
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void ctrlc_reset(void)
{
ctrlc_flag = 0;
}
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int ctrlc_check(void)
{
return ctrlc_flag;
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}
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int read_with_timeout(int fd, uint8_t *data, int max_len)
{
int r;
do {
struct timeval tv = {
.tv_sec = 5,
.tv_usec = 0
};
fd_set set;
FD_ZERO(&set);
FD_SET(fd, &set);
r = select(fd + 1, &set, NULL, NULL, &tv);
if (r > 0)
r = read(fd, data, max_len);
if (!r)
errno = ETIMEDOUT;
if (r <= 0 && errno != EINTR)
return -1;
} while (r <= 0);
return r;
}
/*
* read_all_with_timeout
* read all requested data, or die trying.
*
* Arguments:
* fd: file descriptor from which to read
* data: buffer where data will be put
* len: total size of data to read
*
* Return Value:
* Zero on success. -1 on failure.
*/
int read_all_with_timeout(int fd, uint8_t *data, int len)
{
int r, n_read;
/* loop until all required data has been read (or we time out) */
while (len > 0) {
struct timeval tv = {
.tv_sec = 5,
.tv_usec = 0
};
/* wait (with timeout) for data to become available */
fd_set set;
FD_ZERO(&set);
FD_SET(fd, &set);
r = select(fd + 1, &set, NULL, NULL, &tv);
if (r > 0) {
/* select( ) succeeded */
n_read = read(fd, data, len);
if (n_read <= 0) {
/* read failed */
return -1;
} else {
data += n_read;
len -= n_read;
}
} else if (!r) {
/* select( ) succeeded but timed out */
errno = ETIMEDOUT;
return -1;
} else if (errno != EINTR) {
/* select( ) failed */
return -1;
}
};
return 0;
}
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int write_all(int fd, const uint8_t *data, int len)
{
while (len) {
int result = write(fd, data, len);
if (result < 0) {
if (errno == EINTR)
continue;
return -1;
}
data += result;
len -= result;
}
return 0;
}
static int open_serial_and_set_cflags(const char *device, int rate, tcflag_t set)
{
int fd = open(device, O_RDWR | O_NOCTTY);
struct termios attr;
if (fd < 0)
return -1;
tcgetattr(fd, &attr);
cfmakeraw(&attr);
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cfsetispeed(&attr, rate);
cfsetospeed(&attr, rate);
attr.c_cflag |= set;
if (tcsetattr(fd, TCSAFLUSH, &attr) < 0)
return -1;
return fd;
}
int open_serial(const char *device, int rate)
{
return open_serial_and_set_cflags(device, rate, 0);
}
int open_serial_even_parity(const char *device, int rate) {
return open_serial_and_set_cflags(device, rate, PARENB);
}
char *get_arg(char **text)
{
char *start;
char *rewrite;
char *end;
int qstate = 0;
int qval = 0;
if (!text)
return NULL;
start = *text;
while (*start && isspace(*start))
start++;
if (!*start)
return NULL;
/* We've found the start of the argument. Parse it. */
end = start;
rewrite = start;
while (*end) {
switch (qstate) {
case 0: /* Bare */
if (isspace(*end))
goto out;
else if (*end == '"')
qstate = 1;
else
*(rewrite++) = *end;
break;
case 1: /* In quotes */
if (*end == '"')
qstate = 0;
else if (*end == '\\')
qstate = 2;
else
*(rewrite++) = *end;
break;
case 2: /* Backslash */
if (*end == '\\')
*(rewrite++) = '\\';
else if (*end == 'n')
*(rewrite++) = '\n';
else if (*end == 'r')
*(rewrite++) = '\r';
else if (*end == 't')
*(rewrite++) = '\t';
else if (*end >= '0' && *end <= '3') {
qstate = 30;
qval = *end - '0';
} else if (*end == 'x') {
qstate = 40;
qval = 0;
} else
*(rewrite++) = *end;
if (qstate == 2)
qstate = 1;
break;
case 30: /* Octal */
case 31:
if (*end >= '0' && *end <= '7')
qval = (qval << 3) | (*end - '0');
if (qstate == 31) {
*(rewrite++) = qval;
qstate = 1;
} else {
qstate++;
}
break;
case 40: /* Hex */
case 41:
if (isdigit(*end))
qval = (qval << 4) | (*end - '0');
else if (isupper(*end))
qval = (qval << 4) | (*end - 'A' + 10);
else if (islower(*end))
qval = (qval << 4) | (*end - 'a' + 10);
if (qstate == 41) {
*(rewrite++) = qval;
qstate = 1;
} else {
qstate++;
}
break;
}
end++;
}
out:
/* Leave the text pointer at the end of the next argument */
while (*end && isspace(*end))
end++;
*rewrite = 0;
*text = end;
return start;
}
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void debug_hexdump(const char *label, const uint8_t *data, int len)
{
int offset = 0;
printc("%s [0x%x bytes]\n", label, len);
while (offset < len) {
int i;
printc(" ");
for (i = 0; i < 16 && offset + i < len; i++)
printc("%02x ", data[offset + i]);
printc("\n");
offset += i;
}
}