From 1bcfe887515845678f8f648c6dfecffd01813b0f Mon Sep 17 00:00:00 2001
From: Gediminas Jakutis <gediminas@varciai.lt>
Date: Wed, 19 Feb 2020 14:55:34 +0200
Subject: now with a special generation mode!

Signed-off-by: Gediminas Jakutis <gediminas@varciai.lt>
---
 src/io.c | 181 ++++++++++++++++++++++++++++++++++++++++-----------------------
 1 file changed, 116 insertions(+), 65 deletions(-)

(limited to 'src/io.c')

diff --git a/src/io.c b/src/io.c
index a8dfa2f..f10269c 100644
--- a/src/io.c
+++ b/src/io.c
@@ -10,11 +10,12 @@
 #include <libgen.h>
 #include "io.h"
 
-int stream_open(struct stream *in)
+static int stream_open_in(struct stream * const in);
+static int stream_open_out(struct stream * const in);
+static int stream_open_special(struct stream * const in);
+
+int stream_open(struct stream * const in)
 {
-	struct stat st;
-	mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP;
-	char *dname = NULL;
 	int ret = 0;
 
 	if (!in || in->fd > 0 || !in->name) {
@@ -22,74 +23,19 @@ int stream_open(struct stream *in)
 		goto err;
 	}
 
-	if (in->out) {
-		char *tmp[2];
-
-		tmp[0] = strdup(in->name);
-		tmp[1] = dirname(tmp[0]);
-		dname = strdup(tmp[1]);
-		free(tmp[0]);
-
-		if (stat(dname, &st)) {
-			ret = errno;
-			/* TODO: error message */
-			goto err;
-		}
-
-		if(!(st.st_mode & S_IFDIR)) {
-			ret = EINVAL;
-			/* TODO: error message */
-			goto err;
-		}
-
-		if (!stat(in->name, &st)) {
-			if (!(st.st_mode & S_IFREG)) {
-				ret = EINVAL;
-				/* TODO: error message */
-				goto err;
-			}
-			mode = st.st_mode;
-		}
-	} else if (stat(in->name, &st)) {
-		ret = errno;
-		/* TODO: error message */
-		goto err;
-	} else if (!(st.st_mode & S_IFREG) || !st.st_size || (st.st_size % in->stride)) {
-		ret = EINVAL;
-		/* TODO: error message */
-		goto err;
+	if (in->out == 1) {
+		ret = stream_open_out(in);
+	} else if (!in->out) {
+		ret = stream_open_in(in);
 	} else {
-		in->n = st.st_size / in->stride;
-	}
-
-	if (in->out) {
-		in->fd = open(dname, O_TMPFILE | O_WRONLY, mode);
-		if (in->fd < 0) {
-			ret = errno;
-			/* TODO: error message */
-			goto err;
-		}
-
-		if (ftruncate(in->fd, in->stride * in->n)) {
-			ret = errno;
-			/* TODO: error message */
-			goto err;
-		}
-	} else {
-		in->fd = open(in->name, O_RDONLY | O_NOATIME);
-		if (in->fd < 0) {
-			ret = errno;
-			/* TODO: error message */
-			goto err;
-		}
+		ret = stream_open_special(in);
 	}
 
 err:
-	free(dname);
 	return ret;
 }
 
-int stream_close(struct stream *in)
+int stream_close(struct stream * const in)
 {
 	int ret = 0;
 
@@ -135,3 +81,108 @@ err:
 early_err:
 	return ret;
 }
+
+static int stream_open_out(struct stream * const in)
+{
+	struct stat st;
+	mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP;
+	char *dname = NULL;
+	char *tmp[2];
+	int ret = 0;
+
+	tmp[0] = strdup(in->name);
+	tmp[1] = dirname(tmp[0]);
+	dname = strdup(tmp[1]);
+	free(tmp[0]);
+
+	if (stat(dname, &st)) {
+		ret = errno;
+		/* TODO: error message */
+		goto err;
+	}
+
+	if(!(st.st_mode & S_IFDIR)) {
+		ret = EINVAL;
+		/* TODO: error message */
+		goto err;
+	}
+
+	if (!stat(in->name, &st)) {
+		if (!(st.st_mode & S_IFREG)) {
+			ret = EINVAL;
+			/* TODO: error message */
+			goto err;
+		}
+		mode = st.st_mode;
+	}
+
+	in->fd = open(dname, O_TMPFILE | O_WRONLY, mode);
+
+	if (in->fd < 0) {
+		ret = errno;
+		/* TODO: error message */
+		goto err;
+	}
+
+	if (ftruncate(in->fd, in->stride * in->n)) {
+		ret = errno;
+		/* TODO: error message */
+		goto err;
+	}
+
+err:
+	free(dname);
+	return ret;
+}
+
+static int stream_open_in(struct stream * const in)
+{
+	struct stat st;
+	int ret = 0;
+
+	if (stat(in->name, &st)) {
+		ret = errno;
+		/* TODO: error message */
+		goto err;
+	} else if (!(st.st_mode & S_IFREG) || !st.st_size || (st.st_size % in->stride)) {
+		ret = EINVAL;
+		/* TODO: error message */
+		goto err;
+	} else {
+		in->n = st.st_size / in->stride;
+	}
+
+	in->fd = open(in->name, O_RDONLY | O_NOATIME);
+
+	if (in->fd < 0) {
+		ret = errno;
+		/* TODO: error message */
+		goto err;
+	}
+
+err:
+	return ret;
+}
+
+static int stream_open_special(struct stream * const in)
+{
+	struct stat st;
+	int ret = 0;
+
+	if (stat(in->name, &st)) {
+		ret = errno;
+		/* TODO: error message */
+		goto err;
+	}
+
+	in->fd = open(in->name, O_RDONLY | O_NOATIME);
+
+	if (in->fd < 0) {
+		ret = errno;
+		/* TODO: error message */
+		goto err;
+	}
+
+err:
+	return ret;
+}
-- 
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