Add itoa.

1 files changed, 9 insertions, 0 deletions

diff --git a/cstring/include/cstring.h b/cstring/include/cstring.h
index 9425d51..75a5388 100644
--- a/cstring/include/cstring.h
+++ b/cstring/include/cstring.h
@@ -4,6 +4,7 @@
 #include <assert.h>
 #include <bsd/string.h>
 #include <stdbool.h>
+#include <stdio.h>
 
 /// A fixed-size string.
 /// The string is null-terminated so that it can be used with the usual C APIs.
@@ -90,6 +91,14 @@
                                                                           \
   static inline bool STRING##_eq_cstr(STRING a, const char* b) {          \
     return (a.length == strlen(b)) && strncmp(a.str, b, a.length) == 0;   \
+  }                                                                       \
+                                                                          \
+  static inline STRING STRING##_itoa(int n) {                             \
+    STRING    str     = (STRING){0};                                      \
+    const int written = snprintf(str.str, SIZE, "%d", n);                 \
+    assert(written >= 0);                                                 \
+    str.length = (size_t)written;                                         \
+    return str;                                                           \
   }
 
 DEF_STRING(sstring, 32)    // Small.