1 files changed, 77 insertions, 0 deletions

diff --git a/Documentation/perf_counter/alias.c b/Documentation/perf_counter/alias.c
new file mode 100644
index 000000000000..9b3dd2b428df
--- /dev/null
+++ b/Documentation/perf_counter/alias.c
@@ -0,0 +1,77 @@
+#include "cache.h"
+
+static const char *alias_key;
+static char *alias_val;
+
+static int alias_lookup_cb(const char *k, const char *v, void *cb)
+{
+        if (!prefixcmp(k, "alias.") && !strcmp(k+6, alias_key)) {
+                if (!v)
+                        return config_error_nonbool(k);
+                alias_val = strdup(v);
+                return 0;
+        }
+        return 0;
+}
+
+char *alias_lookup(const char *alias)
+{
+        alias_key = alias;
+        alias_val = NULL;
+        perf_config(alias_lookup_cb, NULL);
+        return alias_val;
+}
+
+int split_cmdline(char *cmdline, const char ***argv)
+{
+        int src, dst, count = 0, size = 16;
+        char quoted = 0;
+
+        *argv = malloc(sizeof(char*) * 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 */
+                        if (count >= size) {
+                                size += 16;
+                                *argv = realloc(*argv, sizeof(char*) * 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(*argv);
+                                        *argv = NULL;
+                                        return error("cmdline ends with \\");
+                                }
+                        }
+                        cmdline[dst++] = c;
+                        src++;
+                }
+        }
+
+        cmdline[dst] = 0;
+
+        if (quoted) {
+                free(*argv);
+                *argv = NULL;
+                return error("unclosed quote");
+        }
+
+        return count;
+}
+