Add mg_rprintf, mg_vrprintf

src/str.h

@@ -31,18 +31,25 @@ bool mg_match(struct mg_str str, struct mg_str pattern, struct mg_str *caps);
 bool mg_globmatch(const char *pattern, size_t plen, const char *s, size_t n);
 bool mg_commalist(struct mg_str *s, struct mg_str *k, struct mg_str *v);
 bool mg_split(struct mg_str *s, struct mg_str *k, struct mg_str *v, char delim);
-size_t mg_vsnprintf(char *buf, size_t len, const char *fmt, va_list *ap);
-size_t mg_snprintf(char *, size_t, const char *fmt, ...);
 char *mg_hex(const void *buf, size_t len, char *dst);
 void mg_unhex(const char *buf, size_t len, unsigned char *to);
 unsigned long mg_unhexn(const char *s, size_t len);
-size_t mg_asprintf(char **, size_t, const char *fmt, ...);
-size_t mg_vasprintf(char **buf, size_t size, const char *fmt, va_list ap);
-char *mg_mprintf(const char *fmt, ...);
-char *mg_vmprintf(const char *fmt, va_list ap);
 int mg_check_ip_acl(struct mg_str acl, uint32_t remote_ip);
 int64_t mg_to64(struct mg_str str);
 uint64_t mg_tou64(struct mg_str str);
 size_t mg_lld(char *buf, int64_t val, bool is_signed, bool is_hex);
 double mg_atod(const char *buf, int len, int *numlen);
 size_t mg_dtoa(char *buf, size_t len, double d, int width);
+
+typedef void (*mg_pc_t)(char, void *);                  // Custom putchar
+typedef size_t (*mg_pm_t)(mg_pc_t, void *, va_list *);  // %M printer
+void mg_putchar_stralloc(char ch, void *param);         // Print to malloced str
+
+size_t mg_vrprintf(void (*)(char, void *), void *, const char *fmt, va_list *);
+size_t mg_rprintf(void (*fn)(char, void *), void *, const char *fmt, ...);
+size_t mg_vsnprintf(char *buf, size_t len, const char *fmt, va_list *ap);
+size_t mg_snprintf(char *, size_t, const char *fmt, ...);
+size_t mg_asprintf(char **, size_t, const char *fmt, ...);
+size_t mg_vasprintf(char **buf, size_t size, const char *fmt, va_list ap);
+char *mg_mprintf(const char *fmt, ...);
+char *mg_vmprintf(const char *fmt, va_list ap);