add sfmt() and sdup()

1 files changed, 27 insertions, 0 deletions

diff --git a/str.h b/str.h
index 47ff676..3f2028d 100644
--- a/str.h
+++ b/str.h
@@ -14,15 +14,20 @@ typedef struct {
 } strv_t;
 
 #define strv(s) (strv_t) { s, strlen(s) }
+#define strvs(s) (strv_t) { s, slen(s) }
 
 string snew(void);
 size_t slen(const string);
 void scats(string *, strv_t);
 void scatc(string *, char);
 void sfree(string);
+string sfmt(const char *fmt, ...);
+string sdup(const char *);
 
 #ifdef STDWRM_IMPL_STR
 
+#include <stdarg.h>
+
 string snew(void) {
 	string s;
 	DA_INIT(s);
@@ -54,5 +59,27 @@ void sfree(string s) {
 	DA_FREE(s);
 }
 
+string sfmt(const char *fmt, ...) {
+	va_list count, print;
+	string s;
+	FILE *f = fopen("/dev/null", "w/o");
+	va_start(print, fmt);
+	va_copy(count, print);
+	size_t n = vfprintf(f, fmt, count) + 1;
+	DA_INIT_SZ(s, n);
+	vsprintf(s, fmt, print);
+	va_end(print);
+	fclose(f);
+	return s;
+}
+
+string sdup(const char *s) {
+	string d;
+	size_t n = strlen(s) + 1;
+	DA_INIT_SZ(d, n);
+	memcpy(d, s, n);
+	return d;
+}
+
 #endif
 #endif