Introduce nvim namespace: Move files.

Move files from src/ to src/nvim/.
- src/nvim/ becomes the new root dir for nvim executable sources.
- src/libnvim/ is planned to become root dir of the neovim library.

src/nvim/memory.h

@@ -0,0 +1,149 @@
+#ifndef NEOVIM_MEMORY_H
+#define NEOVIM_MEMORY_H
+
+#include "func_attr.h"
+#include "types.h"
+#include "vim.h"
+
+char_u *alloc(unsigned size) FUNC_ATTR_MALLOC FUNC_ATTR_ALLOC_SIZE(1);
+
+/// malloc() wrapper
+///
+/// try_malloc() is a malloc() wrapper that tries to free some memory before
+/// trying again.
+///
+/// @see {try_to_free_memory}
+/// @param size
+/// @return pointer to allocated space. NULL if out of memory
+void *try_malloc(size_t size) FUNC_ATTR_MALLOC FUNC_ATTR_ALLOC_SIZE(1);
+
+/// try_malloc() wrapper that shows an out-of-memory error message to the user
+/// before returning NULL
+///
+/// @see {try_malloc}
+/// @param size
+/// @return pointer to allocated space. NULL if out of memory
+void *verbose_try_malloc(size_t size) FUNC_ATTR_MALLOC FUNC_ATTR_ALLOC_SIZE(1);
+
+/// malloc() wrapper that never returns NULL
+///
+/// xmalloc() succeeds or gracefully aborts when out of memory.
+/// Before aborting try to free some memory and call malloc again.
+///
+/// @see {try_to_free_memory}
+/// @param size
+/// @return pointer to allocated space. Never NULL
+void *xmalloc(size_t size)
+  FUNC_ATTR_MALLOC FUNC_ATTR_ALLOC_SIZE(1) FUNC_ATTR_NONNULL_RET;
+
+/// calloc() wrapper
+///
+/// @see {xmalloc}
+/// @param count
+/// @param size
+/// @return pointer to allocated space. Never NULL
+void *xcalloc(size_t count, size_t size)
+  FUNC_ATTR_MALLOC FUNC_ATTR_ALLOC_SIZE_PROD(1, 2) FUNC_ATTR_NONNULL_RET;
+
+/// realloc() wrapper
+///
+/// @see {xmalloc}
+/// @param size
+/// @return pointer to reallocated space. Never NULL
+void *xrealloc(void *ptr, size_t size)
+  FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_ALLOC_SIZE(2) FUNC_ATTR_NONNULL_RET;
+
+/// xmalloc() wrapper that allocates size + 1 bytes and zeroes the last byte
+///
+/// @see {xmalloc}
+/// @param size
+/// @return pointer to allocated space. Never NULL
+void *xmallocz(size_t size) FUNC_ATTR_MALLOC FUNC_ATTR_NONNULL_RET;
+
+/// Allocates (len + 1) bytes of memory, duplicates `len` bytes of
+/// `data` to the allocated memory, zero terminates the allocated memory,
+/// and returns a pointer to the allocated memory. If the allocation fails,
+/// the program dies.
+///
+/// @see {xmalloc}
+/// @param data Pointer to the data that will be copied
+/// @param len number of bytes that will be copied
+void *xmemdupz(const void *data, size_t len) FUNC_ATTR_NONNULL_RET;
+
+/// strdup() wrapper
+///
+/// @see {xmalloc}
+/// @param str 0-terminated string that will be copied
+/// @return pointer to a copy of the string
+char * xstrdup(const char *str)
+ FUNC_ATTR_MALLOC FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_NONNULL_RET;
+
+/// strndup() wrapper
+///
+/// @see {xmalloc}
+/// @param str 0-terminated string that will be copied
+/// @return pointer to a copy of the string
+char * xstrndup(const char *str, size_t len)
+ FUNC_ATTR_MALLOC FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_NONNULL_RET;
+
+/// The xstpcpy() function shall copy the string pointed to by src (including
+/// the terminating NUL character) into the array pointed to by dst.
+///
+/// The xstpcpy() function shall return a pointer to the terminating NUL
+/// character copied into the dst buffer. This is the only difference with
+/// strcpy(), which returns dst.
+///
+/// WARNING: If copying takes place between objects that overlap, the behavior is
+/// undefined.
+///
+/// This is the Neovim version of stpcpy(3) as defined in POSIX 2008. We
+/// don't require that supported platforms implement POSIX 2008, so we
+/// implement our own version.
+///
+/// @param dst
+/// @param src
+char *xstpcpy(char *restrict dst, const char *restrict src);
+
+/// The xstpncpy() function shall copy not more than n bytes (bytes that follow
+/// a NUL character are not copied) from the array pointed to by src to the
+/// array pointed to by dst.
+///
+/// If a NUL character is written to the destination, the xstpncpy() function
+/// shall return the address of the first such NUL character. Otherwise, it
+/// shall return &dst[maxlen].
+///
+/// WARNING: If copying takes place between objects that overlap, the behavior is
+/// undefined.
+///
+/// WARNING: xstpncpy will ALWAYS write maxlen bytes. If src is shorter than
+/// maxlen, zeroes will be written to the remaining bytes.
+///
+/// TODO(aktau): I don't see a good reason to have this last behaviour, and
+/// it is potentially wasteful. Could we perhaps deviate from the standard
+/// and not zero the rest of the buffer?
+///
+/// @param dst
+/// @param src
+/// @param maxlen
+char *xstpncpy(char *restrict dst, const char *restrict src, size_t maxlen);
+
+/// Duplicates a chunk of memory using xmalloc
+///
+/// @see {xmalloc}
+/// @param data pointer to the chunk
+/// @param len size of the chunk
+/// @return a pointer
+char *xmemdup(const char *data, size_t len)
+ FUNC_ATTR_MALLOC FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_NONNULL_RET;
+
+/// Old low level memory allocation function.
+///
+/// @deprecated use xmalloc() directly instead
+/// @param size
+/// @return pointer to allocated space. Never NULL
+char_u *lalloc(long_u size, int message) FUNC_ATTR_MALLOC FUNC_ATTR_ALLOC_SIZE(1);
+
+void do_outofmem_msg(long_u size);
+void free_all_mem(void);
+
+#endif