Created
March 24, 2011 03:04
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ttystrip
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#include <sys/types.h> | |
#include <sys/stat.h> | |
#include <fcntl.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <unistd.h> | |
#define BUFSIZE 8192 | |
void usage(char *prgm) { | |
printf("Usage: %s [ttyrec ...]\n", prgm); | |
} | |
int min(int a, int b) { | |
if (a < b) | |
return a; | |
return b; | |
} | |
void strip(int fd) { | |
const int bufsize = BUFSIZE; | |
int frames; | |
char buf[BUFSIZE]; | |
int *size; | |
int frame_size; | |
int offset; | |
int n; | |
int bytes_read; | |
int bytes_offset; | |
frames = 0; | |
frame_size = offset = n = 0; | |
bytes_offset = 0; | |
bytes_read = bufsize; | |
while ((n = read(fd, &buf[bytes_offset], bytes_read)) > 0) { | |
/* If there is data from the previous frame in the buffer, | |
* output that. | |
*/ | |
if (offset > 0) { | |
write(1, buf, offset); | |
} | |
while ((offset + 12) < (n + bytes_offset)) { | |
/* Skip first eight bytes for each frame. */ | |
size = (int *) &buf[offset+8]; | |
frame_size = *size; | |
write(1, &buf[offset+12], min(frame_size, n + bytes_offset - offset - 12)); | |
offset += frame_size + 12; | |
} | |
/* Check if the header was only partially in the buffer. */ | |
if (offset >= bufsize) { | |
bytes_offset = 0; | |
bytes_read = bufsize; | |
offset -= bufsize; | |
} | |
else { | |
memmove(&buf[0], &buf[offset], bufsize - offset); | |
bytes_offset = bufsize - offset; | |
bytes_read = offset; | |
offset = 0; | |
} | |
} | |
} | |
int main(int argc, char **argv) { | |
int fd; | |
if (argc == 1) { | |
strip(0); | |
} | |
else if (strcmp(argv[1], "-h") == 0 || | |
strcmp(argv[1], "--help") == 0) { | |
usage(argv[0]); | |
exit(0); | |
} | |
else { | |
int i; | |
for (i = 1; i < argc; i++) { | |
if ((fd = open(argv[i], O_RDONLY)) == -1) { | |
fprintf(stderr, "Unable to open %s\n", argv[1]); | |
exit(1); | |
} | |
strip(fd); | |
close(fd); | |
} | |
} | |
return 0; | |
} |
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