From c53f547a0bf437fb95923b2a0b9ac497e474aef1 Mon Sep 17 00:00:00 2001
From: Maria Matejka <mq@ucw.cz>
Date: Tue, 15 Mar 2022 11:21:46 +0100
Subject: [PATCH] Printf variant with a result allocated inside a pool /
 linpool

---
 lib/printf.c    | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 lib/resource.c  | 29 ++++++++++++++---------------
 lib/resource.h  |  2 +-
 lib/string.h    |  5 +++++
 nest/rt-table.c |  7 +------
 5 files changed, 69 insertions(+), 22 deletions(-)

diff --git a/lib/printf.c b/lib/printf.c
index 236df427..424d545f 100644
--- a/lib/printf.c
+++ b/lib/printf.c
@@ -568,3 +568,51 @@ buffer_puts(buffer *buf, const char *str)
 
   buf->pos = (bp < be) ? bp : buf->end;
 }
+
+#define POOL_PRINTF_MAXBUF	1024
+
+char *mb_vsprintf(pool *p, const char *fmt, va_list args)
+{
+  char buf[POOL_PRINTF_MAXBUF];
+  int count = bvsnprintf(buf, POOL_PRINTF_MAXBUF, fmt, args);
+
+  if (count < 0)
+    bug("Attempted to mb_vsprintf() a too long string");
+
+  char *out = mb_alloc(p, count + 1);
+  memcpy(out, buf, count + 1);
+  return out;
+}
+
+char *mb_sprintf(pool *p, const char *fmt, ...)
+{
+  va_list args;
+  char *out;
+  va_start(args, fmt);
+  out = mb_vsprintf(p, fmt, args);
+  va_end(args);
+  return out;
+}
+
+char *lp_vsprintf(linpool *p, const char *fmt, va_list args)
+{
+  char buf[POOL_PRINTF_MAXBUF];
+  int count = bvsnprintf(buf, POOL_PRINTF_MAXBUF, fmt, args);
+
+  if (count < 0)
+    bug("Attempted to mb_vsprintf() a too long string");
+
+  char *out = lp_alloc(p, count + 1);
+  memcpy(out, buf, count + 1);
+  return out;
+}
+
+char *lp_sprintf(linpool *p, const char *fmt, ...)
+{
+  va_list args;
+  char *out;
+  va_start(args, fmt);
+  out = lp_vsprintf(p, fmt, args);
+  va_end(args);
+  return out;
+}
diff --git a/lib/resource.c b/lib/resource.c
index a179afe3..89e559b4 100644
--- a/lib/resource.c
+++ b/lib/resource.c
@@ -70,6 +70,20 @@ rp_new(pool *p, const char *name)
   return z;
 }
 
+pool *
+rp_newf(pool *p, const char *fmt, ...)
+{
+  pool *z = rp_new(p, NULL);
+
+  va_list args;
+  va_start(args, fmt);
+  z->name = mb_vsprintf(p, fmt, args);
+  va_end(args);
+
+  return z;
+}
+
+
 static void
 pool_free(resource *P)
 {
@@ -410,21 +424,6 @@ mb_realloc(void *m, unsigned size)
   return b->data;
 }
 
-/**
- * mb_move - move a memory block
- * @m: memory block
- * @p: target pool
- *
- * mb_move() moves the given memory block to another pool in the same way
- * as rmove() moves a plain resource.
- */
-void
-mb_move(void *m, pool *p)
-{
-  struct mblock *b = SKIP_BACK(struct mblock, data, m);
-  rmove(b, p);
-}
-
 
 /**
  * mb_free - free a memory block
diff --git a/lib/resource.h b/lib/resource.h
index 313b01dc..ed9e109d 100644
--- a/lib/resource.h
+++ b/lib/resource.h
@@ -44,6 +44,7 @@ typedef struct pool pool;
 
 void resource_init(void);
 pool *rp_new(pool *, const char *);	/* Create new pool */
+pool *rp_newf(pool *, const char *, ...);	/* Create a new pool with a formatted string as its name */
 void rfree(void *);			/* Free single resource */
 void rdump(void *);			/* Dump to debug output */
 struct resmem rmemsize(void *res);		/* Return size of memory used by the resource */
@@ -59,7 +60,6 @@ extern pool root_pool;
 void *mb_alloc(pool *, unsigned size);
 void *mb_allocz(pool *, unsigned size);
 void *mb_realloc(void *m, unsigned size);
-void mb_move(void *, pool *);
 void mb_free(void *);
 
 /* Memory pools with linear allocation */
diff --git a/lib/string.h b/lib/string.h
index 976b1c24..2829943d 100644
--- a/lib/string.h
+++ b/lib/string.h
@@ -20,6 +20,11 @@ int bvsprintf(char *str, const char *fmt, va_list args);
 int bsnprintf(char *str, int size, const char *fmt, ...);
 int bvsnprintf(char *str, int size, const char *fmt, va_list args);
 
+char *mb_sprintf(pool *p, const char *fmt, ...);
+char *mb_vsprintf(pool *p, const char *fmt, va_list args);
+char *lp_sprintf(linpool *p, const char *fmt, ...);
+char *lp_vsprintf(linpool *p, const char *fmt, va_list args);
+
 int buffer_vprint(buffer *buf, const char *fmt, va_list args);
 int buffer_print(buffer *buf, const char *fmt, ...);
 void buffer_puts(buffer *buf, const char *str);
diff --git a/nest/rt-table.c b/nest/rt-table.c
index b3ca3d05..a1e49c21 100644
--- a/nest/rt-table.c
+++ b/nest/rt-table.c
@@ -2094,12 +2094,7 @@ static struct resclass rt_class = {
 rtable *
 rt_setup(pool *pp, struct rtable_config *cf)
 {
-  int ns = strlen("Routing table ") + strlen(cf->name) + 1;
-  void *nb = mb_alloc(pp, ns);
-  ASSERT_DIE(ns - 1 == bsnprintf(nb, ns, "Routing table %s", cf->name));
-
-  pool *p = rp_new(pp, nb);
-  mb_move(nb, p);
+  pool *p = rp_newf(pp, "Routing table %s", cf->name);
 
   rtable *t = ralloc(p, &rt_class);
   t->rp = p;