/*******************************************************************/

/*  slibtool: a skinny libtool implementation, written in C        */

/*  Copyright (C) 2016--2024  SysDeer Technologies, LLC            */

/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */

/*******************************************************************/

#include <ctype.h>

#include <stdint.h>

#include <stddef.h>

#include <stdlib.h>

#include <string.h>

#include <sys/mman.h>

#include <slibtool/slibtool.h>

#include "slibtool_driver_impl.h"

#include "slibtool_errinfo_impl.h"

static int slbt_lib_free_symlist_ctx_impl(

	struct slbt_symlist_ctx_impl *  ctx,

	struct slbt_input *             mapinfo,

	int                             ret)

{

	if (mapinfo)

		slbt_fs_unmap_input(mapinfo);

	if (ctx) {

		if (ctx->pathbuf)

			free(ctx->pathbuf);

		if (ctx->symstrs)

			free(ctx->symstrs);

		if (ctx->symstrv)

			free(ctx->symstrv);

		free(ctx);

	}

	return ret;

}

int slbt_lib_get_symlist_ctx(

	const struct slbt_driver_ctx *  dctx,

	const char *                    path,

	struct slbt_symlist_ctx **      pctx)

{

	struct slbt_symlist_ctx_impl *  ctx;

	struct slbt_input               mapinfo;

	size_t                          nsyms;

	char *                          ch;

	char *                          cap;

	char *                          src;

	const char **                   psym;

	char                            dummy;

	bool                            fvalid;

	/* map symlist file temporarily */

	if (slbt_fs_map_input(dctx,-1,path,PROT_READ,&mapinfo) < 0)

		return SLBT_NESTED_ERROR(dctx);

	/* alloc context */

	if (!(ctx = calloc(1,sizeof(*ctx))))

		return slbt_lib_free_symlist_ctx_impl(

			ctx,&mapinfo,

			SLBT_BUFFER_ERROR(dctx));

	/* count symbols */

	src = mapinfo.size ? mapinfo.addr : &dummy;

	cap = &src[mapinfo.size];

	for (; (src

		src++;

	for (ch=src,nsyms=0; ch

		for (; (ch

			ch++;

		fvalid = false;

		for (; (ch

			fvalid = (*ch++ == '\n') || fvalid;

		if (!fvalid)

			return slbt_lib_free_symlist_ctx_impl(

				ctx,&mapinfo,

				SLBT_CUSTOM_ERROR(

					dctx,

					SLBT_ERR_FLOW_ERROR));

	}

	/* clone path, alloc string buffer and symbol vector */

	if (!(ctx->pathbuf = strdup(path)))

		return slbt_lib_free_symlist_ctx_impl(

			ctx,&mapinfo,

			SLBT_SYSTEM_ERROR(dctx,0));

	if (!(ctx->symstrs = calloc(mapinfo.size+1,1)))

		return slbt_lib_free_symlist_ctx_impl(

			ctx,&mapinfo,

			SLBT_SYSTEM_ERROR(dctx,0));

	if (!(ctx->symstrv = calloc(nsyms+1,sizeof(char *))))

		return slbt_lib_free_symlist_ctx_impl(

			ctx,&mapinfo,

			SLBT_SYSTEM_ERROR(dctx,0));

	/* copy the source to the allocated string buffer */

	memcpy(ctx->symstrs,mapinfo.addr,mapinfo.size);

	slbt_fs_unmap_input(&mapinfo);

	/* populate the symbol vector, handle whitespace */

	src = ctx->symstrs;

	cap = &src[mapinfo.size];

	for (; (src

		src++;

	for (ch=src,psym=ctx->symstrv; ch

		*psym = ch;

		for (; (ch

			ch++;

		for (; (ch

			*ch++ = '\0';

	}

	/* all done */

	ctx->dctx         = dctx;

	ctx->path         = ctx->pathbuf;

	ctx->sctx.path	  = &ctx->path;

	ctx->sctx.symstrv = ctx->symstrv;

	*pctx = &ctx->sctx;

	return 0;

}

void slbt_lib_free_symlist_ctx(struct slbt_symlist_ctx * ctx)

{

	struct slbt_symlist_ctx_impl *	ictx;

	uintptr_t			addr;

	if (ctx) {

		addr = (uintptr_t)ctx - offsetof(struct slbt_symlist_ctx_impl,sctx);

		ictx = (struct slbt_symlist_ctx_impl *)addr;

		slbt_lib_free_symlist_ctx_impl(ictx,0,0);

	}

}