Prevent crashes and leaks on allocation failure (#606)

* Prevent crashes and leaks on allocation failure

Memory allocation can fail. We need to gracefully handle this case and
prevent dereferencing null pointers.

* Make NULL checks consistent within a file

* Properly report allocation errors

* Improve cleanup in pj_gc_reader.c

* Implement pj_strdup and use instead of strdup

The function strdup is not part of ANSI C 89, but a POSIX extension.
Therefore we can not rely on it being available on all platforms.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/proj_api.h b/src/proj_api.h
index 2add2946..151a824d 100644
--- a/src/proj_api.h
+++ b/src/proj_api.h
@@ -167,6 +167,7 @@ void *pj_malloc(size_t);
 void pj_dalloc(void *);
 void *pj_calloc (size_t n, size_t size);
 void *pj_dealloc (void *ptr);
+char *pj_strdup(const char *str);
 char *pj_strerrno(int);
 int *pj_get_errno_ref(void);
 const char *pj_get_release(void);