Cleanup: move all the compatibillity fluff to a dedicated "libcompat"

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

4 files changed, 130 insertions, 0 deletions

diff --git a/lib/compat/Makemodule.am b/lib/compat/Makemodule.am
new file mode 100644
index 0000000..c197fb0
--- /dev/null
+++ b/lib/compat/Makemodule.am
@@ -0,0 +1,4 @@
+libcompat_a_SOURCES = lib/compat/getline.c lib/compat/getsubopt.c
+libcompat_a_SOURCES += lib/compat/strndup.c include/compat.h
+
+noinst_LIBRARIES += libcompat.a
diff --git a/lib/compat/getline.c b/lib/compat/getline.c
new file mode 100644
index 0000000..f330c6d
--- /dev/null
+++ b/lib/compat/getline.c
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * getline.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+#include "compat.h"
+
+#include <string.h>
+#include <stdlib.h>
+
+#ifndef HAVE_GETLINE
+ssize_t getline(char **line, size_t *n, FILE *fp)
+{
+	size_t new_cap, len = 0, cap = 0;
+	char *buffer = NULL, *new;
+	int c;
+
+	if (feof(fp) || ferror(fp))
+		return -1;
+
+	do {
+		c = fgetc(fp);
+
+		if (ferror(fp))
+			return -1;
+
+		if (c == EOF)
+			c = '\n';
+
+		if (len == cap) {
+			new_cap = cap ? cap * 2 : 32;
+			new = realloc(buffer, new_cap);
+
+			if (new == NULL)
+				return -1;
+
+			buffer = new;
+			cap = new_cap;
+		}
+
+		buffer[len++] = c;
+	} while (c != '\n');
+
+	*line = buffer;
+	*n = len;
+	return len;
+}
+#endif
diff --git a/lib/compat/getsubopt.c b/lib/compat/getsubopt.c
new file mode 100644
index 0000000..d53a37d
--- /dev/null
+++ b/lib/compat/getsubopt.c
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * getsubopt.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+#include "compat.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#ifndef HAVE_GETSUBOPT
+int getsubopt(char **opt, char *const *keys, char **val)
+{
+	char *str = *opt;
+	size_t i, len;
+
+	*val = NULL;
+	*opt = strchr(str, ',');
+
+	if (*opt == NULL) {
+		*opt = str + strlen(str);
+	} else {
+		*(*opt)++ = '\0';
+	}
+
+	for (i = 0; keys[i]; ++i) {
+		len = strlen(keys[i]);
+
+		if (strncmp(keys[i], str, len) != 0)
+			continue;
+
+		if (str[len] != '=' && str[len] != '\0')
+			continue;
+
+		if (str[len] == '=')
+			*val = str + len + 1;
+
+		return i;
+	}
+
+	return -1;
+}
+#endif
diff --git a/lib/compat/strndup.c b/lib/compat/strndup.c
new file mode 100644
index 0000000..dff79d7
--- /dev/null
+++ b/lib/compat/strndup.c
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * strndup.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+#include "compat.h"
+
+#include <string.h>
+#include <stdlib.h>
+
+#ifndef HAVE_STRNDUP
+char *strndup(const char *str, size_t max_len)
+{
+	size_t len = 0;
+	char *out;
+
+	while (len < max_len && str[len] != '\0')
+		++len;
+
+	out = malloc(len + 1);
+
+	if (out != NULL) {
+		memcpy(out, str, len);
+		out[len] = '\0';
+	}
+
+	return out;
+}
+#endif