/* collapse.c
*
* Copy stdin to stdout, throwing away backslash newline pairs;
* all other backslashes and newlines are left alone. This means
* that input ending with backslash newline will produce an output
* that is not newline terminated.
*/
#include <stdio.h>
int
main(int argc, char **argv)
{
int c;
while ((c=getchar())!=EOF) {
if (c=='\\') {
if ((c=getchar())!='\n') {
putchar('\\');
if (c==EOF)
break;
else
putchar(c);
}
}
else
putchar(c);
}
fflush(stdout);
if (ferror(stdout)) {
perror("stdout");
return 2;
}
else if (ferror(stdin)) {
perror("stdin");
return 1;
}
else
return 0;
}
Doing this one character at a time means there are no line length limits
whatsoever. And converting to wide character support is easy enough:
#include <stdio.h>
#include <locale.h>
#include <wchar.h>
int
main(int argc, char **argv)
{
wint_t c;
(void) setlocale(LC_ALL,"");
while ((c=getwchar())!=WEOF) {
if (c==L'\\') {
if ((c=getwchar())!=L'\n') {
putwchar('\\');
if (c==WEOF)
break;
else
putwchar(c);
}
}
else
putwchar(c);
}
fflush(stdout);
if (ferror(stdout)) {
perror("stdout");
return 2;
}
else if (ferror(stdin)) {
perror("stdin");
return 1;
}
else
return 0;
}
--
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