Add a minimal fallback implementation for getline()

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

4 files changed, 58 insertions, 2 deletions

diff --git a/configure.ac b/configure.ac
index 6093717..d468a2a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -218,7 +218,7 @@ AX_COMPILE_CHECK_SIZEOF(long long)
 AC_CHECK_HEADERS([sys/xattr.h], [], [])
 AC_CHECK_HEADERS([sys/sysinfo.h], [], [])
 
-AC_CHECK_FUNCS([strndup])
+AC_CHECK_FUNCS([strndup getline])
 
 ##### generate output #####
 
diff --git a/include/util/compat.h b/include/util/compat.h
index 8566090..5c9e4fb 100644
--- a/include/util/compat.h
+++ b/include/util/compat.h
@@ -110,6 +110,12 @@ struct stat {
 #include <sys/sysmacros.h>
 #endif
 
+#ifndef HAVE_GETLINE
+#include <stdio.h>
+
+ssize_t getline(char **line, size_t *n, FILE *fp);
+#endif
+
 #ifndef HAVE_STRNDUP
 char *strndup(const char *str, size_t max_len);
 #endif
diff --git a/lib/util/Makemodule.am b/lib/util/Makemodule.am
index e624bbd..23e5c4e 100644
--- a/lib/util/Makemodule.am
+++ b/lib/util/Makemodule.am
@@ -1,7 +1,7 @@
 libutil_la_SOURCES = include/util/util.h include/util/compat.h
 libutil_la_SOURCES += lib/util/str_table.c include/util/str_table.h
 libutil_la_SOURCES += lib/util/alloc.c lib/util/canonicalize_name.c
-libutil_la_SOURCES += lib/util/strndup.c
+libutil_la_SOURCES += lib/util/strndup.c lib/util/getline.c
 libutil_la_CFLAGS = $(AM_CFLAGS)
 libutil_la_CPPFLAGS = $(AM_CPPFLAGS)
 libutil_la_LDFLAGS = $(AM_LDFLAGS)
diff --git a/lib/util/getline.c b/lib/util/getline.c
new file mode 100644
index 0000000..996bef2
--- /dev/null
+++ b/lib/util/getline.c
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/*
+ * getline.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+#include "util/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