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#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <err.h>
int
main(int argc, const char *argv[])
{
unsigned char trim = 0;
if (argc > 1)
trim = strtoul(argv[1], NULL, 10);
bool leading = true;
size_t rd, out_sz = 0, out_allocated = 0;
char buf[4096], *out = NULL;
while ((rd = fread(buf, 1, sizeof(buf), stdin))) {
for (const char *s = buf; s < buf + rd; ++s) {
if (*s == trim && leading)
continue;
if (out_sz >= out_allocated) {
if (!(out = realloc(out, out_allocated += sizeof(buf))))
err(EXIT_FAILURE, "realloc");
}
out[out_sz++] = *s;
leading = false;
}
const char *s;
for (s = out + (out_sz ? out_sz - 1 : 0); s > out && *s == trim; --s);
const size_t to_write = (size_t)(s - out);
if (fwrite(out, 1, to_write, stdout) != to_write)
err(EXIT_FAILURE, "fwrite");
memmove(out, s, (out_sz = out_sz - to_write));
}
free(out);
return EXIT_SUCCESS;
}
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