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/*
C: The Complete Reference, 4th Ed. (Paperback)
by Herbert Schildt
ISBN: 0072121246
Publisher: McGraw-Hill Osborne Media; 4 edition (April 26, 2000)
*/
#include <stdio.h>
#include <stdlib.h>
#define TAB_SIZE 8
#define IN 0
#define OUT 1
void err(int e);
int main(int argc, char *argv[])
{
FILE *in, *out;
int tab, i;
char ch;
if(argc!=3) {
printf("usage: detab <in> <out>\n");
exit(1);
}
if((in = fopen(argv[1], "rb"))==NULL) {
printf("Cannot open %s.\n", argv[1]);
exit(1);
}
if((out = fopen(argv[2], "wb"))==NULL) {
printf("Cannot open %s.\n", argv[1]);
exit(1);
}
tab = 0;
do {
ch = getc(in);
if(ferror(in)) err(IN);
/* if tab found, output appropriate number of spaces */
if(ch=='\t') {
for(i=tab; i<8; i++) {
putc(' ', out);
if(ferror(out)) err(OUT);
}
tab = 0;
}
else {
putc(ch, out);
if(ferror(out)) err(OUT);
tab++;
if(tab==TAB_SIZE) tab = 0;
if(ch=='\n' || ch=='\r') tab = 0;
}
} while(!feof(in));
fclose(in);
fclose(out);
return 0;
}
void err(int e)
{
if(e==IN) printf("Error on input.\n");
else printf("Error on output.\n");
exit(1);
}
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