str: Thread-local buffer for int to string

Signed-off-by: Andrew Opalach <andrew@akon.city>

1 files changed, 20 insertions, 0 deletions

diff --git a/src/str.c b/src/str.c
index 2ad46aa..25b267a 100644
--- a/src/str.c
+++ b/src/str.c
@@ -1,5 +1,25 @@
 #include "../include/al/str.h"
 
+static __thread char printbuf[24];
+static __thread str printstr = {
+    .length = 0,
+    .alloc = 0,
+    .data = NULL
+};
+
+#define DEFINE_PRINT_FUNC(type, fmt) \
+    str *al_print_##type(type n) \
+    { \
+        s32 ret = al_snprintf(printbuf, sizeof(printbuf), fmt, n); \
+        al_assert(ret > 0 && (size_t)ret < sizeof(printbuf)); \
+        printstr.length = ret; \
+        printstr.data = printbuf; \
+        return &printstr; \
+    }
+
+DEFINE_PRINT_FUNC(u32, "%u")
+DEFINE_PRINT_FUNC(s32, "%d")
+
 // https://sourceware.org/git/?p=newlib-cygwin.git;a=blob;f=newlib/libc/stdlib/strtol.c;h=09d4333ed05f497ec00b7192204644349441e58d;hb=HEAD#l130
 s64 al_str_to_long(str *s, u32 base, bool *error)
 {