Import official C23 code examples for Modern C (Jens Gustedt, 2024)HEADupstream-importmain

- Add official C source files, Makefile, c23-fallback.h, and LICENSE
- Update README.md with study mirror notice

1 files changed, 26 insertions, 0 deletions

diff --git a/cat.c b/cat.c
new file mode 100644
index 0000000..9baadb5
--- /dev/null
+++ b/cat.c
@@ -0,0 +1,26 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+
+enum { buf_max = 32, };
+
+int main(int argc, char* argv[argc+1]) {
+  int ret = EXIT_FAILURE;
+  char buffer[buf_max] = { };
+  for (int i = 1; i < argc; ++i) {        // Processes args
+    FILE* instream = fopen(argv[i], "r"); // as filenames
+    if (instream) {
+      while (fgets(buffer, buf_max, instream)) {
+        fputs(buffer, stdout);
+      }
+      fclose(instream);
+      ret = EXIT_SUCCESS;
+    } else {
+      /* Provides some error diagnostic. */
+      fprintf(stderr, "Could not open %s: ", argv[i]);
+      perror(0);
+      errno = 0;                       // Resets the error code
+    }
+  }
+  return ret;
+}