shithub: rgbds

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Handle errors when opening source file

Before this commit, opening a file for which the user didn't have
permission resulted in a "Bad file descriptor" error.

--- a/src/asm/lexer.c

+++ b/src/asm/lexer.c

@@ -473,6 +473,11 @@

 	state->path = path;

 	state->isFile = true;

 	state->fd = isStdin ? STDIN_FILENO : open(path, O_RDONLY);

+	if (state->fd < 0) {

+		error("Failed to open file \"%s\": %s\n", path, strerror(errno));

+		free(state);

+		return NULL;

+	}

 	state->isMmapped = false; /* By default, assume it won't be mmap()ed */

 	if (!isStdin && fileInfo.st_size > 0) {

 		/* Try using `mmap` for better performance */