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src/{fvec,cvec,lvec,fmat}.c: make sure new_ functions return NULL if length <= 0

--- a/src/cvec.c

+++ b/src/cvec.c

@@ -22,6 +22,9 @@

 #include "cvec.h"

 cvec_t * new_cvec( uint_t length) {

+  if ((sint_t)length <= 0) {

+    return NULL;

+  }

   cvec_t * s = AUBIO_NEW(cvec_t);

   s->length = length/2 + 1;

   s->norm = AUBIO_ARRAY(smpl_t,s->length);

--- a/src/fmat.c

+++ b/src/fmat.c

@@ -22,6 +22,9 @@

 #include "fmat.h"

 fmat_t * new_fmat (uint_t length, uint_t height) {

+  if ((sint_t)length <= 0 || (sint_t)height <= 0 ) {

+    return NULL;

+  }

   fmat_t * s = AUBIO_NEW(fmat_t);

   uint_t i,j;

   s->height = height;

--- a/src/fvec.c

+++ b/src/fvec.c

@@ -22,6 +22,9 @@

 #include "fvec.h"

 fvec_t * new_fvec( uint_t length) {

+  if ((sint_t)length <= 0) {

+    return NULL;

+  }

   fvec_t * s = AUBIO_NEW(fvec_t);

   s->length = length;

   s->data = AUBIO_ARRAY(smpl_t, s->length);

--- a/src/lvec.c

+++ b/src/lvec.c

@@ -22,6 +22,9 @@

 #include "lvec.h"

 lvec_t * new_lvec( uint_t length) {

+  if ((sint_t)length <= 0) {

+    return NULL;

+  }

   lvec_t * s = AUBIO_NEW(lvec_t);

   s->length = length;

   s->data = AUBIO_ARRAY(lsmp_t, s->length);

-- 

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