1 files changed, 90 insertions, 0 deletions
diff --git a/alias.c b/alias.c
new file mode 100644
index 0000000000..bf146e5263
--- /dev/null
+++ b/alias.c
@@ -0,0 +1,90 @@
+#include "cache.h"
+#include "config.h"
+
+struct config_alias_data {
+	const char *alias;
+	char *v;
+};
+
+static int config_alias_cb(const char *key, const char *value, void *d)
+{
+	struct config_alias_data *data = d;
+	const char *p;
+
+	if (skip_prefix(key, "alias.", &p) && !strcasecmp(p, data->alias))
+		return git_config_string((const char **)&data->v, key, value);
+
+	return 0;
+}
+
+char *alias_lookup(const char *alias)
+{
+	struct config_alias_data data = { alias, NULL };
+
+	read_early_config(config_alias_cb, &data);
+
+	return data.v;
+}
+
+#define SPLIT_CMDLINE_BAD_ENDING 1
+#define SPLIT_CMDLINE_UNCLOSED_QUOTE 2
+static const char *split_cmdline_errors[] = {
+	"cmdline ends with \\",
+	"unclosed quote"
+};
+
+int split_cmdline(char *cmdline, const char ***argv)
+{
+	int src, dst, count = 0, size = 16;
+	char quoted = 0;
+
+	ALLOC_ARRAY(*argv, size);
+
+	/* split alias_string */
+	(*argv)[count++] = cmdline;
+	for (src = dst = 0; cmdline[src];) {
+		char c = cmdline[src];
+		if (!quoted && isspace(c)) {
+			cmdline[dst++] = 0;
+			while (cmdline[++src]
+					&& isspace(cmdline[src]))
+				; /* skip */
+			ALLOC_GROW(*argv, count + 1, size);
+			(*argv)[count++] = cmdline + dst;
+		} else if (!quoted && (c == '\'' || c == '"')) {
+			quoted = c;
+			src++;
+		} else if (c == quoted) {
+			quoted = 0;
+			src++;
+		} else {
+			if (c == '\\' && quoted != '\'') {
+				src++;
+				c = cmdline[src];
+				if (!c) {
+					FREE_AND_NULL(*argv);
+					return -SPLIT_CMDLINE_BAD_ENDING;
+				}
+			}
+			cmdline[dst++] = c;
+			src++;
+		}
+	}
+
+	cmdline[dst] = 0;
+
+	if (quoted) {
+		FREE_AND_NULL(*argv);
+		return -SPLIT_CMDLINE_UNCLOSED_QUOTE;
+	}
+
+	ALLOC_GROW(*argv, count + 1, size);
+	(*argv)[count] = NULL;
+
+	return count;
+}
+
+const char *split_cmdline_strerror(int split_cmdline_errno)
+{
+	return split_cmdline_errors[-split_cmdline_errno - 1];
+}