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scr2str.c
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scr2str.c
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/*
* Screen to stream converter and vice versa
* used to filter screen files for CVS
* written in C, so that I can run it on systems without installing Forth
*/
#include <stdio.h>
#include <string.h>
#include <errno.h>
#define B_BLK 0x400
#define C_L 0x40
int backscan(char * block, int n, char c)
{
for(n--; n>=0 && (block[n] == c); n--);
return n < 0 ? 0 : n + (block[n] != c);
}
int ctrlmask(char * p, char * o, int n)
{
int i, k=0;
for(i=0; i<n; i++) {
switch(p[i]) {
case '\0' ... ' '-1:
*o++ = '^';
*o++ = p[i] + '@';
k+=2;
break;
case '^':
*o++ = '^';
*o++ = '~';
k+=2;
break;
default:
*o++ = p[i];
k++;
break;
}
}
return k;
}
int ctrlunmask(char * p, char * o, int n)
{
int i, k=0;
for(i=0; i<n; i++) {
switch(p[i]) {
case '^':
if(p[++i] == '~') {
*o++ = '^';
} else {
*o++ = p[i] - '@';
}
k++;
break;
default:
*o++ = p[i];
k++;
break;
}
}
return k;
}
void scr2str(FILE * in, FILE * out)
{
char block[B_BLK];
char line[C_L*2];
int n, i, k;
do {
memset(block, ' ', B_BLK);
n = fread(block, 1, B_BLK, in);
if(n == 0) break;
n = backscan(block, n, ' ');
for(i=0; i < n; i+= C_L) {
k = backscan(block+i, C_L, ' ');
k = ctrlmask(block+i, line, k);
fwrite(line, 1, k, out);
fwrite("\n", 1, 1, out);
}
fwrite("\f\n", 2, 1, out);
} while(1);
}
void str2scr(FILE * in, FILE * out)
{
char block[B_BLK];
char line[2*C_L+3];
int n, i=0, k=0;
memset(block, ' ', B_BLK);
while(!feof(in)) {
fgets(line, 2*C_L+2, in);
if(feof(in)) break;
if(!strcmp(line, "\f\n")) {
fwrite(block, 1, B_BLK, out);
memset(block, ' ', B_BLK);
k = 0;
} else {
n = strlen(line);
if(n)
n -= (line[n-1]=='\n');
n = ctrlunmask(line, line, n);
memcpy(block+k, line, n);
k += C_L;
}
}
}
int main(int argc, char ** argv, char ** env)
{
int arglen = strlen(argv[0])-strlen("scr2str");
int what = !strcmp(argv[0]+arglen, "scr2str");
FILE * in = stdin;
FILE * out = stdout;
if(argc > 1) {
if(strcmp(argv[1], "-")) {
if(!(in = fopen(argv[1], "rb"))) {
fprintf(stderr, "Error opening input file: %s\n", strerror(errno));
return -1;
}
}
}
if(argc > 2) {
if(!(out = fopen(argv[2], "wb"))) {
fprintf(stderr, "Error opening output file: %s\n", strerror(errno));
return -1;
}
}
if(what)
scr2str(in, out);
else
str2scr(in, out);
return 0;
}