mirror of
https://github.com/nodemcu/nodemcu-firmware.git
synced 2025-01-30 21:12:55 +08:00
526d21dab4
The PR removed the bulk of non-newlib headers from the NodeMCU source base. app/libc has now been cut down to the bare minimum overrides to shadow the corresponding functions in the SDK's libc. The old c_xyz.h headerfiles have been nuked in favour of the standard <xyz.h> headers, with a few exceptions over in sdk-overrides. Again, shipping a libc.a without headers is a terrible thing to do. We're still living on a prayer that libc was configured the same was as a default-configured xtensa gcc toolchain assumes it is. That part I cannot do anything about, unfortunately, but it's no worse than it has been before. This enables our source files to compile successfully using the standard header files, and use the typical malloc()/calloc()/realloc()/free(), the strwhatever()s and memwhatever()s. These end up, through macro and linker magic, mapped to the appropriate SDK or ROM functions.
86 lines
1.7 KiB
C
86 lines
1.7 KiB
C
/*
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** $Id: lzio.c,v 1.31.1.1 2007/12/27 13:02:25 roberto Exp $
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** a generic input stream interface
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** See Copyright Notice in lua.h
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*/
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#define lzio_c
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#define LUA_CORE
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#define LUAC_CROSS_FILE
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#include "lua.h"
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#include <string.h>
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#include "llimits.h"
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#include "lmem.h"
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#include "lstate.h"
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#include "lzio.h"
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int luaZ_fill (ZIO *z) {
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size_t size;
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lua_State *L = z->L;
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const char *buff;
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lua_unlock(L);
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buff = z->reader(L, z->data, &size);
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lua_lock(L);
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if (buff == NULL || size == 0) return EOZ;
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z->n = size - 1;
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z->p = buff;
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return char2int(*(z->p++));
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}
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int luaZ_lookahead (ZIO *z) {
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if (z->n == 0) {
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if (luaZ_fill(z) == EOZ)
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return EOZ;
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else {
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z->n++; /* luaZ_fill removed first byte; put back it */
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z->p--;
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}
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}
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return char2int(*z->p);
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}
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void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader, void *data) {
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z->L = L;
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z->reader = reader;
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z->data = data;
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z->n = z->i = 0;
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z->p = NULL;
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}
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/* --------------------------------------------------------------- read --- */
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size_t luaZ_read (ZIO *z, void *b, size_t n) {
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while (n) {
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size_t m;
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if (luaZ_lookahead(z) == EOZ)
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return n; /* return number of missing bytes */
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m = (n <= z->n) ? n : z->n; /* min. between n and z->n */
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if (b)
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memcpy(b, z->p, m);
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z->n -= m;
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z->i += m;
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z->p += m;
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if (b)
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b = (char *)b + m;
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n -= m;
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}
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return 0;
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}
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/* ------------------------------------------------------------------------ */
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char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n) {
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if (n > buff->buffsize) {
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if (n < LUA_MINBUFFER) n = LUA_MINBUFFER;
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luaZ_resizebuffer(L, buff, n);
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}
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return buff->buffer;
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}
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