1 files changed, 91 insertions, 0 deletions

diff --git a/tools/lib/subcmd/subcmd-util.h b/tools/lib/subcmd/subcmd-util.h
new file mode 100644
index 000000000000..321aeb11a381
--- /dev/null
+++ b/tools/lib/subcmd/subcmd-util.h
@@ -0,0 +1,91 @@
+#ifndef __PERF_SUBCMD_UTIL_H
+#define __PERF_SUBCMD_UTIL_H
+
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#define NORETURN __attribute__((__noreturn__))
+
+static inline void report(const char *prefix, const char *err, va_list params)
+{
+        char msg[1024];
+        vsnprintf(msg, sizeof(msg), err, params);
+        fprintf(stderr, " %s%s\n", prefix, msg);
+}
+
+static NORETURN inline void die(const char *err, ...)
+{
+        va_list params;
+
+        va_start(params, err);
+        report(" Fatal: ", err, params);
+        exit(128);
+        va_end(params);
+}
+
+#define zfree(ptr) ({ free(*ptr); *ptr = NULL; })
+
+#define alloc_nr(x) (((x)+16)*3/2)
+
+/*
+ * Realloc the buffer pointed at by variable 'x' so that it can hold
+ * at least 'nr' entries; the number of entries currently allocated
+ * is 'alloc', using the standard growing factor alloc_nr() macro.
+ *
+ * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
+ */
+#define ALLOC_GROW(x, nr, alloc) \
+        do { \
+                if ((nr) > alloc) { \
+                        if (alloc_nr(alloc) < (nr)) \
+                                alloc = (nr); \
+                        else \
+                                alloc = alloc_nr(alloc); \
+                        x = xrealloc((x), alloc * sizeof(*(x))); \
+                } \
+        } while(0)
+
+static inline void *xrealloc(void *ptr, size_t size)
+{
+        void *ret = realloc(ptr, size);
+        if (!ret && !size)
+                ret = realloc(ptr, 1);
+        if (!ret) {
+                ret = realloc(ptr, size);
+                if (!ret && !size)
+                        ret = realloc(ptr, 1);
+                if (!ret)
+                        die("Out of memory, realloc failed");
+        }
+        return ret;
+}
+
+#define astrcatf(out, fmt, ...)                                         \
+({                                                                      \
+        char *tmp = *(out);                                             \
+        if (asprintf((out), "%s" fmt, tmp ?: "", ## __VA_ARGS__) == -1) \
+                die("asprintf failed");                                 \
+        free(tmp);                                                      \
+})
+
+static inline void astrcat(char **out, const char *add)
+{
+        char *tmp = *out;
+
+        if (asprintf(out, "%s%s", tmp ?: "", add) == -1)
+                die("asprintf failed");
+
+        free(tmp);
+}
+
+static inline int prefixcmp(const char *str, const char *prefix)
+{
+        for (; ; str++, prefix++)
+                if (!*prefix)
+                        return 0;
+                else if (*str != *prefix)
+                        return (unsigned char)*prefix - (unsigned char)*str;
+}
+
+#endif /* __PERF_SUBCMD_UTIL_H */