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

/*  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 <fcntl.h>

#include <stdio.h>

#include <limits.h>

#include <unistd.h>

#include <string.h>

#include <stdlib.h>

#include <stdbool.h>

#include <inttypes.h>

#include <sys/stat.h>

#include <sys/wait.h>

#include <slibtool/slibtool.h>

#include "slibtool_ar_impl.h"

#include "slibtool_driver_impl.h"

#include "slibtool_dprintf_impl.h"

#include "slibtool_snprintf_impl.h"

#include "slibtool_errinfo_impl.h"

static const char ar_symbol_type_A[] = "A";

static const char ar_symbol_type_B[] = "B";

static const char ar_symbol_type_C[] = "C";

static const char ar_symbol_type_D[] = "D";

static const char ar_symbol_type_G[] = "G";

static const char ar_symbol_type_I[] = "I";

static const char ar_symbol_type_R[] = "R";

static const char ar_symbol_type_S[] = "S";

static const char ar_symbol_type_T[] = "T";

static const char ar_symbol_type_W[] = "W";

static const char * const ar_symbol_type['Z'-'A'] = {

	['A'-'A'] = ar_symbol_type_A,

	['B'-'A'] = ar_symbol_type_B,

	['C'-'A'] = ar_symbol_type_C,

	['D'-'A'] = ar_symbol_type_D,

	['G'-'A'] = ar_symbol_type_G,

	['I'-'A'] = ar_symbol_type_I,

	['R'-'A'] = ar_symbol_type_R,

	['S'-'A'] = ar_symbol_type_S,

	['T'-'A'] = ar_symbol_type_T,

	['W'-'A'] = ar_symbol_type_W,

};

static void slbt_ar_update_syminfo_child(

	char *	program,

	char *  arname,

	int	fdout)

{

	char *	argv[6];

	argv[0] = program;

	argv[1] = "-P";

	argv[2] = "-A";

	argv[3] = "-g";

	argv[4] = arname;

	argv[5] = 0;

	if (dup2(fdout,1) == 1)

		execvp(program,argv);

	_exit(EXIT_FAILURE);

}

static int slbt_obtain_nminfo(

	struct slbt_archive_ctx_impl *  ictx,

	struct slbt_exec_ctx *          ectx,

	const struct slbt_driver_ctx *  dctx,

	struct slbt_archive_meta_impl * mctx)

{

	int     pos;

	int	fdcwd;

	pid_t   pid;

	pid_t   rpid;

	int     fdout;

	char ** argv;

	char    arname [PATH_MAX];

	char    output [PATH_MAX];

	char	program[PATH_MAX];

	/* fdcwd */

	fdcwd = slbt_driver_fdcwd(dctx);

	/* tool-specific argument vector */

	argv = (slbt_get_driver_ictx(dctx))->host.nm_argv;

	/* ar alternate argument vector */

	if (argv) {

		if (slbt_snprintf(program,sizeof(program),

				"%s",argv[0]) < 0)

			return SLBT_BUFFER_ERROR(dctx);

	} else {

		if (slbt_snprintf(program,sizeof(program),

				"%s",dctx->cctx->host.nm) < 0)

			return SLBT_BUFFER_ERROR(dctx);

	}

	/* output (.nm suffix, buf treat as .syminfo) */

	pos = slbt_snprintf(

		arname,sizeof(arname)-8,"%s",

		ictx->path);

	strcpy(output,arname);

	strcpy(&output[pos],".nm");

	/* fork */

	if ((fdout = openat(fdcwd,output,O_CREAT|O_TRUNC|O_WRONLY,0644)) < 0)

		return SLBT_SYSTEM_ERROR(dctx,output);

	if ((pid = fork()) < 0) {

		close(fdout);

		return SLBT_SYSTEM_ERROR(dctx,0);

	}

	/* child */

	if (pid == 0)

		slbt_ar_update_syminfo_child(

			program,arname,fdout);

	/* parent */

	ectx->pid = pid;

	rpid = waitpid(

		pid,

		&ectx->exitcode,

		0);

	if (rpid < 0) {

		return SLBT_SYSTEM_ERROR(dctx,0);

	} else if (ectx->exitcode) {

		return SLBT_CUSTOM_ERROR(

			dctx,

			SLBT_ERR_FLOW_ERROR);

	}

	if (slbt_lib_get_txtfile_ctx(

			dctx,output,

			&mctx->nminfo) < 0)

		return SLBT_NESTED_ERROR(dctx);

	return 0;

}

static int slbt_get_symbol_nm_info(

	struct slbt_archive_ctx *       actx,

	struct slbt_archive_meta_impl * mctx,

	uint64_t                        idx)

{

	int                             cint;

	const char **                   pline;

	const char *                    mark;

	const char *                    cap;

	const char *                    objname;

	const char *                    symname;

	struct ar_meta_symbol_info *    syminfo;

	struct ar_meta_member_info **   pmember;

	symname = mctx->symstrv[idx];

	syminfo = &mctx->syminfo[idx];

	for (pline=mctx->nminfo->txtlinev; *pline; pline++) {

		mark = *pline;

		if (!(mark = strchr(mark,']')))

			return -1;

		if ((*++mark != ':') || (*++mark != ' '))

			return -1;

		cap = ++mark;

		for (; *cap && !isspace((cint = *cap)); )

			cap++;

		if (*cap != ' ')

			return -1;

		if (!(strncmp(symname,mark,cap-mark))) {

			mark = ++cap;

			/* space only according to posix, but ... */

			if (mark[1] && (mark[1] != ' '))

				return -1;

			switch (mark[0]) {

				case 'A':

				case 'B':

				case 'C':

				case 'D':

				case 'G':

				case 'I':

				case 'R':

				case 'S':

				case 'T':

				case 'W':

					syminfo->ar_symbol_type = ar_symbol_type[mark[0]-'A'];

					break;

				default:

					break;

			}

			if (syminfo->ar_symbol_type) {

				syminfo->ar_archive_name = *actx->path;

				syminfo->ar_symbol_name  = symname;

				if (!(mark = strchr(*pline,'[')))

					return -1;

				if (!(cap = strchr(++mark,']')))

					return -1;

			}

			pmember = mctx->memberv;

			for (; *pmember && !syminfo->ar_object_name; ) {

				objname = (*pmember)->ar_file_header.ar_member_name;

				if (!(strncmp(objname,mark,cap-mark)))

					syminfo->ar_object_name = objname;

				pmember++;

			}

			mctx->syminfv[idx] = syminfo;

		}

	}

	return (mctx->syminfv[idx] ? 0 : (-1));

}

slbt_hidden int slbt_ar_update_syminfo(

	struct slbt_archive_ctx * actx,

	struct slbt_exec_ctx *    ectx)

{

	const struct slbt_driver_ctx *  dctx;

	struct slbt_archive_ctx_impl *  ictx;

	struct slbt_archive_meta_impl * mctx;

	uint64_t                        idx;

	/* driver context, etc. */

	ictx = slbt_get_archive_ictx(actx);

	mctx = slbt_archive_meta_ictx(ictx->meta);

	dctx = ictx->dctx;

	/* nm -P -A -g */

	if (mctx->armaps.armap_nsyms) {

		if (slbt_obtain_nminfo(ictx,ectx,dctx,mctx) < 0)

			return SLBT_NESTED_ERROR(dctx);

	} else {

		if (slbt_lib_get_txtfile_ctx(

				dctx,"/dev/null",

				&mctx->nminfo) < 0)

			return SLBT_NESTED_ERROR(dctx);

	}

	/* free old syminfo vector */

	if (mctx->syminfv)

		free(mctx->syminfv);

	/* syminfo vector: armap symbols only */

	if (!(mctx->syminfo = calloc(

			mctx->armaps.armap_nsyms + 1,

			sizeof(*mctx->syminfo))))

		return SLBT_SYSTEM_ERROR(dctx,0);

	if (!(mctx->syminfv = calloc(

			mctx->armaps.armap_nsyms + 1,

			sizeof(*mctx->syminfv))))

		return SLBT_SYSTEM_ERROR(dctx,0);

	/* do the thing */

	for (idx=0; idx<mctx->armaps.armap_nsyms; idx++)

		if (slbt_get_symbol_nm_info(actx,mctx,idx) < 0)

			return SLBT_CUSTOM_ERROR(

				dctx,

				SLBT_ERR_FLOW_ERROR);

	/* yay */

	return 0;

}