Import project skeleton from rts

https://gitea.privatedns.org/xavi/rts

1 files changed, 67 insertions, 0 deletions

diff --git a/tools/add-header.c b/tools/add-header.c
new file mode 100644
index 0000000..75f7458
--- /dev/null
+++ b/tools/add-header.c
@@ -0,0 +1,67 @@
+#include <errno.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main(int argc, char **const argv)
+{
+    int ret = EXIT_FAILURE;
+    FILE *in = NULL, *out = NULL;
+
+    if (argc < 3)
+    {
+        fprintf(stderr, "%s [arg ...] <in-file> <out-file>\n", *argv);
+        goto end;
+    }
+
+    const char *const in_path = argv[argc - 2],
+        *const out_path = argv[argc - 1];
+
+    if (!(out = fopen(out_path, "wb")))
+    {
+        fprintf(stderr, "could not open %s: %s\n", out_path, strerror(errno));
+        goto end;
+    }
+    else if (!(in = fopen(in_path, "rb")))
+    {
+        fprintf(stderr, "could not open %s: %s\n", in_path, strerror(errno));
+        goto end;
+    }
+
+    for (int i = 1; i < argc - 2; i++)
+    {
+        if (fprintf(out, "%s", argv[i]) < 0
+            || putc('\0', out) == EOF
+            || ferror(out))
+        {
+            fprintf(stderr, "failed writing to %s\n", out_path);
+            goto end;
+        }
+    }
+
+    while (!feof(in))
+    {
+        char c;
+
+        if ((!fread(&c, sizeof c, 1, in)
+            || !fwrite(&c, sizeof c, 1, out))
+            && (ferror(in) || ferror(out)))
+        {
+            fprintf(stderr, "ferror(%s)=%d, ferror(%s)=%d\n",
+                in_path, ferror(in), out_path, ferror(out));
+            goto end;
+        }
+    }
+
+    ret = EXIT_SUCCESS;
+
+end:
+    if (out)
+        fclose(out);
+
+    if (in)
+        fclose(in);
+
+    return ret;
+}