/*
   +----------------------------------------------------------------------+
   | PHP Version 5                                                        |
   +----------------------------------------------------------------------+
   | Copyright (c) 1997-2013 The PHP Group                                |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | http://www.php.net/license/3_01.txt                                  |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Authors: Felipe Pena <felipe@php.net>                                |
   | Authors: Joe Watkins <joe.watkins@live.co.uk>                        |
   +----------------------------------------------------------------------+
*/

#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#ifndef _WIN32
#	include <sys/mman.h>
#	include <unistd.h>
#endif
#include <fcntl.h>
#include "phpdbg.h"
#include "phpdbg_list.h"
#include "phpdbg_utils.h"

ZEND_EXTERN_MODULE_GLOBALS(phpdbg);

PHPDBG_LIST(lines) /* {{{ */
{
	if (!PHPDBG_G(exec) && !zend_is_executing(TSRMLS_C)) {
		phpdbg_error("Not executing, and execution context not set");
		return SUCCESS;
	}

	switch (param->type) {
		case NUMERIC_PARAM:
		case EMPTY_PARAM:
			phpdbg_list_file(phpdbg_current_file(TSRMLS_C),
				param->type == EMPTY_PARAM ? 0 : param->num,
				zend_get_executed_lineno(TSRMLS_C), 0 TSRMLS_CC);
			break;
		case FILE_PARAM:
			phpdbg_list_file(param->file.name, param->file.line, 0, 0 TSRMLS_CC);
			break;

		phpdbg_default_switch_case();
	}

    return SUCCESS;
} /* }}} */

PHPDBG_LIST(func) /* {{{ */
{
    switch (param->type) {
        case STR_PARAM:
            phpdbg_list_function_byname(
                param->str, param->len TSRMLS_CC);
        break;

        phpdbg_default_switch_case();
    }

    return SUCCESS;
} /* }}} */

PHPDBG_LIST(method) /* {{{ */
{
    switch (param->type) {
        case METHOD_PARAM: {
            zend_class_entry **ce;

            if (zend_lookup_class(param->method.class, strlen(param->method.class), &ce TSRMLS_CC) == SUCCESS) {
                zend_function *function;
                char *lcname = zend_str_tolower_dup(
                    param->method.name, strlen(param->method.name));

                if (zend_hash_find(&(*ce)->function_table, lcname, strlen(lcname)+1, (void**) &function) == SUCCESS) {
                    phpdbg_list_function(
                        function TSRMLS_CC);
                } else {
                    phpdbg_error("Could not find %s::%s", param->method.class, param->method.name);
                }

                efree(lcname);
            } else {
                phpdbg_error("Could not find the class %s", param->method.class);
            }
        } break;

        phpdbg_default_switch_case();
    }

    return SUCCESS;
} /* }}} */

PHPDBG_LIST(class) /* {{{ */
{
    switch (param->type) {
        case STR_PARAM: {
            zend_class_entry **ce;

            if (zend_lookup_class(param->str, param->len, &ce TSRMLS_CC) == SUCCESS) {
                if ((*ce)->type == ZEND_USER_CLASS) {
                    if ((*ce)->info.user.filename) {
                        phpdbg_list_file(
                            (*ce)->info.user.filename,
                            (*ce)->info.user.line_end - (*ce)->info.user.line_start + 1,
                            (*ce)->info.user.line_start, 0 TSRMLS_CC
                        );
                    } else {
                        phpdbg_error("The source of the requested class (%s) cannot be found", (*ce)->name);
                    }
                } else {
                    phpdbg_error("The class requested (%s) is not user defined", (*ce)->name);
                }
            } else {
                phpdbg_error("The requested class (%s) could not be found", param->str);
            }
        } break;

        phpdbg_default_switch_case();
    }

    return SUCCESS;
} /* }}} */

void phpdbg_list_file(const char *filename, long count, long offset, int highlight TSRMLS_DC) /* {{{ */
{
	unsigned char *mem, *pos, *last_pos, *end_pos;
	struct stat st;
#ifndef _WIN32
	int fd;
#else
	HANDLE fd, map;
#endif
	int all_content = (count == 0);
	int line = 0, displayed = 0;

    	if (VCWD_STAT(filename, &st) == FAILURE) {
		phpdbg_error("Failed to stat file %s", filename);
		return;
	}

#ifndef _WIN32
	if ((fd = VCWD_OPEN(filename, O_RDONLY)) == FAILURE) {
		phpdbg_error("Failed to open file %s to list", filename);
		return;
	}

	pos = last_pos = mem = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
	end_pos = mem + st.st_size;
#else

	fd = CreateFile(filename, GENERIC_READ, FILE_SHARE_READ,  NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
	if (fd == INVALID_HANDLE_VALUE) {
		phpdbg_error("Failed to open file!");
		return;
	}

	map = CreateFileMapping(fd, NULL, PAGE_READONLY, 0, 0, NULL);
	if (map == NULL) {
		phpdbg_error("Failed to map file!");
		CloseHandle(fd);
		return;
	}

	pos = last_pos = mem = (char*) MapViewOfFile(map, FILE_MAP_READ, 0, 0, 0);
	if (mem == NULL) {
		phpdbg_error("Failed to map file in memory");
		CloseHandle(map);
		CloseHandle(fd);
		return;
	}
	end_pos = mem + st.st_size;
#endif
	while (1) {
		if (pos == end_pos) {
			break;
		}

		pos = memchr(last_pos, '\n', end_pos - last_pos);

		if (!pos) {
			/* No more line breaks */
			pos = end_pos;
		}

		++line;

		if (!offset || offset <= line) {
			/* Without offset, or offset reached */
			if (!highlight) {
			    phpdbg_writeln("%05u: %.*s", line, (int)(pos - last_pos), last_pos);
			} else {
			    if (highlight != line) {
			        phpdbg_writeln(" %05u: %.*s", line, (int)(pos - last_pos), last_pos);
			    } else phpdbg_writeln(">%05u: %.*s", line, (int)(pos - last_pos), last_pos);
			}
			++displayed;
		}

		last_pos = pos + 1;

		if (!all_content && displayed == count) {
			/* Reached max line to display */
			break;
		}
	}

#ifndef _WIN32
	munmap(mem, st.st_size);
	close(fd);
#else
	UnmapViewOfFile(mem);
	CloseHandle(map);
	CloseHandle(fd);
#endif
} /* }}} */

void phpdbg_list_function(const zend_function *fbc TSRMLS_DC) /* {{{ */
{
	const zend_op_array *ops;

	if (fbc->type != ZEND_USER_FUNCTION) {
	    phpdbg_error(
	        "The function requested (%s) is not user defined", fbc->common.function_name);
		return;
	}

	ops = (zend_op_array*)fbc;

	phpdbg_list_file(ops->filename,
		ops->line_end - ops->line_start + 1, ops->line_start, 0 TSRMLS_CC);
} /* }}} */

void phpdbg_list_function_byname(const char *str, size_t len TSRMLS_DC) /* {{{ */
{
    HashTable *func_table = EG(function_table);
    zend_function* fbc;
    char *func_name = (char*) str;
    size_t func_name_len = len;

    /* search active scope if begins with period */
    if (func_name[0] == '.') {
       if (EG(scope)) {
           func_name++;
           func_name_len--;

           func_table = &EG(scope)->function_table;
       } else {
           phpdbg_error("No active class");
           return;
       }
    } else if (!EG(function_table)) {
        phpdbg_error("No function table loaded");
        return;
    } else {
        func_table = EG(function_table);
    }

    /* use lowercase names, case insensitive */
    func_name = zend_str_tolower_dup(func_name, func_name_len);

    if (zend_hash_find(func_table, func_name, func_name_len+1,
        (void**)&fbc) == SUCCESS) {
        phpdbg_list_function(fbc TSRMLS_CC);
    } else {
        phpdbg_error("Function %s not found", func_name);
    }

    efree(func_name);
} /* }}} */