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// SPDX-FileCopyrightText: 2024 Tomasz Kramkowski <tomasz@kramkow.ski>
// SPDX-LicenseIdentifier: GPL-3.0-or-later
// A tool to combine two files by replacing every instance of the character
// sequence %s with the contents of the file named by the first argument.
// This tool does not support escaping.
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static const char *argv0 = "combine";
void dump(FILE *f)
{
if (fseek(f, 0, SEEK_SET) != 0) {
fprintf(stderr, "%s: error: Failed to rewind inclusion file: %s",
argv0, strerror(errno));
exit(EXIT_FAILURE);
}
int c;
while (c = fgetc(f), c != EOF) putchar(c);
}
int main(int argc, char **argv)
{
if (argv[0] != NULL) argv0 = argv[0];
if (argc != 2) {
fprintf(stderr, "Usage: %s inclusion\n", argv0);
return EXIT_FAILURE;
}
FILE *inclusion = fopen(argv[1], "r");
if (inclusion == NULL) {
fprintf(stderr, "%s: error: Failed to open \"%s\": %s\n", argv0,
argv[1], strerror(errno));
return EXIT_FAILURE;
}
bool was_percent = false;
int c;
while (c = getchar(), c != EOF) {
if (was_percent) {
was_percent = false;
if (c == 's') {
dump(inclusion);
} else {
putchar('%');
putchar(c);
}
} else {
if (c == '%')
was_percent = true;
else
putchar(c);
}
}
}
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