Added: new flag NDBUF_MOLS - if applied it will use allocless/memcpyless

escan e.g. just setup pointers to appropriate values within a raw
buffer memory piece.

include/ndbuf/ndbuf.h

@@ -5,12 +5,12 @@
  * (c) Alexander Vdolainen 2016 <avdolainen@zoho.com>
  * (c) Alexander Vdolainen 2017 <alex@vapaa.xyz>
  *
- * libtbusd is free software: you can redistribute it and/or modify it
+ * libndbuf is free software: you can redistribute it and/or modify it
  * under the terms of the GNU Lesser General Public License as published
  * by the Free Software Foundation, either version 2.1 of the License, or
  * (at your option) any later version.
  *
- * libtbusd is distributed in the hope that it will be useful, but
+ * libndbuf is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  * See the GNU Lesser General Public License for more details.
@@ -27,10 +27,15 @@
 
 #define NDBUF_TERMINAT  0xdeadbeef
 
+/* List of supported flags: */
 #define NDBUF_BURN  (1 << 1)  /* burn buffer data before free */
 #define NDBUF_NREA  (1 << 2)  /* non reallocatable buffer */
 #define NDBUF_UCMO  (1 << 3)  /* user defined memops functions */
 #define NDBUF_RORB  (1 << 4)  /* read-only buffer */
+#define NDBUF_MOLS  (1 << 5)  /* "memory-ops"-less escan i.e. return
+                               * pointers to the raw buffer itself,
+                               *  instead of alloc/memcpy
+                               */
 
 struct ndbuf_memops {
   void *(*alloc)(size_t);

ndbuf.c

@@ -2,14 +2,14 @@
  * Networking binary buffers pack/unpack library
  *
  * (c) Alexander Vdolainen 2016 <avdolainen@zoho.com>
- * (c) Alexander Vdolainen 2017 <alex@vapaa.xyz>
+ * (c) Alexander Vdolainen 2017, 2018 <alex@vapaa.xyz>
  *
- * libtbusd is free software: you can redistribute it and/or modify it
+ * libndbuf is free software: you can redistribute it and/or modify it
  * under the terms of the GNU Lesser General Public License as published
  * by the Free Software Foundation, either version 2.1 of the License, or
  * (at your option) any later version.
  *
- * libtbusd is distributed in the hope that it will be useful, but
+ * libndbuf is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  * See the GNU Lesser General Public License for more details.
@@ -420,8 +420,14 @@ uint32_t ndbuf_write_raw_head(ndbuf_t *b, void *wi, uint32_t len)
 }
 
 /* parse */
+#define __is_moless(x)  ((x) & NDBUF_MOLS) ? 1 : 0
+#define __is_usermo(x)  ((x) & NDBUF_UCMO) ? 1 : 0
+
 int ndbuf_escan_va(ndbuf_t *b, const char *fmt, int argc, va_list ap)
 {
+  register uint32_t fo = b->flags;
+  register uint32_t len;
+  uint32_t clen;
   va_list ap_copy;
   union {
     uint8_t *_u8;
@@ -433,7 +439,6 @@ int ndbuf_escan_va(ndbuf_t *b, const char *fmt, int argc, va_list ap)
     ndbuf_t **_rdb;
   } d;
   const char *t, *last;
-  uint32_t len, clen;
   int r, count;
 
   va_copy(ap_copy, ap);
@@ -474,8 +479,15 @@ int ndbuf_escan_va(ndbuf_t *b, const char *fmt, int argc, va_list ap)
         r = -1;
         break;
       }
+      /* FIXME: Document the following line in manpages %limits% */
       if(clen > NDBUF_MAXLENGTH) goto __errrbread;
-      if((*d._cstr = malloc(clen + sizeof(char))) == NULL) {
+
+      if(__is_moless(fo)) {
+        *d._cstr = b->raw + b->curr;
+      } else {
+        if(__is_usermo(fo)) *d._cstr = b->mop->alloc(clen + sizeof(char));
+        else *d._cstr = malloc(clen + sizeof(char));
+        if(*d._cstr == NULL) {
           r = -ENOMEM;
           break;
         }
@@ -486,6 +498,7 @@ int ndbuf_escan_va(ndbuf_t *b, const char *fmt, int argc, va_list ap)
         }
         (*d._cstr)[len] = '\0';
         d._cstr = NULL;
+      }
       r = 0;
       break;
     case 'p':
@@ -495,7 +508,12 @@ int ndbuf_escan_va(ndbuf_t *b, const char *fmt, int argc, va_list ap)
       *d._dp = NULL;
       count++;
 
-      if((*d._dp = malloc(clen)) == NULL) {
+      if(__is_moless(fo)) {
+        *d._dp = b->raw + b->curr;
+      } else {
+        if(__is_usermo(fo)) *d._dp = b->mop->alloc(clen);
+        else *d._dp = malloc(clen);
+        if(*d._dp == NULL) {
           r = -ENOMEM;
           break;
         }
@@ -504,6 +522,7 @@ int ndbuf_escan_va(ndbuf_t *b, const char *fmt, int argc, va_list ap)
           free(*d._dp);
           goto __errrbread;
         }
+      }
       d._dp = NULL;
       r = 0;
       break;
@@ -516,7 +535,12 @@ int ndbuf_escan_va(ndbuf_t *b, const char *fmt, int argc, va_list ap)
         r = -1;
         break;
       }
-      if((*d._dp = malloc(clen)) == NULL) {
+      if(__is_moless(fo)) {
+        *d._dp = b->raw + b->curr;
+      } else {
+        if(__is_usermo(fo)) *d._dp = b->mop->alloc(clen);
+        else *d._dp = malloc(clen);
+        if(*d._dp == NULL) {
           r = -ENOMEM;
           break;
         }
@@ -525,10 +549,11 @@ int ndbuf_escan_va(ndbuf_t *b, const char *fmt, int argc, va_list ap)
           free(*d._dp);
           goto __errrbread;
         }
+      }
       d._dp = NULL;
       r = 0;
       break;
-    case 'R':
+    case 'R': /* FIXME: what about moless and user defined ops ? */
       d._rdb = va_arg(ap, ndbuf_t **);
       *d._rdb = NULL;
 
@@ -579,10 +604,15 @@ int ndbuf_escan_va(ndbuf_t *b, const char *fmt, int argc, va_list ap)
         break;
       case 's':
         d._cstr = va_arg(ap_copy, char **);
-        if(*d._cstr) {
+        if(*d._cstr && !__is_moless(fo)) {
+          if(__is_usermo(fo)) {
+            b->mop->zero(*d._cstr, strlen(*d._cstr));
+            b->mop->free(*d._cstr);
+          } else {
             memset(*d._cstr, 0, strlen(*d._cstr));
             free(*d._cstr);
           }
+        }
         break;
       case 'R':
         d._rdb = va_arg(ap_copy, ndbuf_t **);
@@ -592,7 +622,10 @@ int ndbuf_escan_va(ndbuf_t *b, const char *fmt, int argc, va_list ap)
         (void)va_arg(ap_copy, size_t);
       case 'P':
         d._dp = va_arg(ap_copy, void **);
-        if(*d._dp) free(*d._dp);
+        if(*d._dp && !__is_moless(fo)) {
+          if(__is_usermo(fo)) b->mop->free(*d._dp);
+          else free(*d._dp);
+        }
         break;
       default:
         (void)va_arg(ap_copy, void *);