Add environment spoofing

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 30 insertions, 0 deletions

diff --git a/libfonts_getenv__.c b/libfonts_getenv__.c
new file mode 100644
index 0000000..d998337
--- /dev/null
+++ b/libfonts_getenv__.c
@@ -0,0 +1,30 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+const char *
+libfonts_getenv__(const char *name, struct libfonts_context *ctx)
+{
+	char **envp;
+	size_t len = strlen(name);
+
+#ifdef VALIDATE
+	size_t i;
+	if (!name) {
+		fprintf(stderr, "`name` parameter in libfonts_getenv__ is NULL\n");
+		abort();
+	}
+	for (i = 0; libfonts_used_environs[i]; i++)
+		if (!strcmp(name, libfonts_used_environs[i]))
+			goto ok;
+	fprintf(stderr, "Value of `name` parameter (\"%s\") in libfonts_getenv__ is not in libfonts_used_environs\n", name);
+	abort();
+ok:
+#endif
+
+	if (ctx && ctx->environ)
+		for (envp = ctx->environ; *envp; envp++)
+			if (strncmp(*envp, name, len) && (*envp)[len] == '=')
+				return *envp;
+	return ctx->ignore_process_environ ? NULL : getenv(name);
+}