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Учебное пособие по CGI-программированию от Леши

Trics and traps

Я так решил назвать эту часть,потому что это название больше всего соответствует.
Я вам в этой части расскажу о всяких тонких и неочевидных местах и о том как с этим боротся.
Продолжая тему отладки, я обнаружил что многие столкнулись с одной неочевидной проблеммой когда скрипты создают дома, помимо того, что надо перевести раскладку Windows (или DOS) в koi8-r скрипты все равно отказывались работать. Признаюсь ,хоть и разобрался в чем дело я быстро, причина весьма неочевидна: Дело в том,что текстовый файл Windows содержит перед символом перехода на новую строку еще символ возврата каретки. А вот из-за этого скрипт и отказывался выполнятся, что содержал этот символ!
Методом решения (этот процесс как и все я максимально автоматизирую) стал коротенький скрипт delcr .Просто "натравливайте" его на ваши скрипты:delcr *.cgi

#!/usr/bin/perl
#delcr
unless(@ARGV){die "Usage: delcr file ....\n";}
foreach $file(@ARGV){
 if(! -r $file || ! -w $file){print "$file: access denied\n";}
 else{
  open(F,"+<$file")|| die "Cannot open $file $!\n";
  binmode(F) || die "Cannot binmode $file $!\n";
  @D=<F>;
  seek(F,0,0);
  foreach(@D){
    s/\r//g;
    print F;
    }
  truncate(F,tell(F));
  close(F);
  }
 }
Саму же взаимную перекодировку Dos<->koi-8<->Win поможет выполнить вот такая прога. Написал я ее очень давно, даже раньше чем занялся CGI программированием и с тех давних пор она меня все время выручала, став моим по-настоящему незаменимым и верным другом. Итак, знакомьтесь: txtconv -Утилита перевода раскладок символов. 
#include<stdio.h>
#include<string.h>
/*****************/
char tbldw[256]={
 0x0,0x1,0x2,0x3,0x4,0x5,0x6,0x7,0x8,0x9,0xa,0xb,0xc,0xd,0xe,0xf,
 0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f,
 0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f,
 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f,
 0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x4b,0x4c,0x4d,0x4e,0x4f,
 0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5a,0x5b,0x5c,0x5d,0x5e,0x5f,
 0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f,
 0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x7b,0x7c,0x7d,0x7e,0x7f,

 0xc0,0xc1,0xc2,0xc3,0xc4,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xcb,0xcc,0xcd,0xce,0xcf,
 0xd0,0xd1,0xd2,0xd3,0xd4,0xd5,0xd6,0xd7,0xd8,0xd9,0xda,0xdb,0xdc,0xdd,0xde,0xdf,
 0xe0,0xe1,0xe2,0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,0xeb,0xec,0xed,0xee,0xef,
 0x5f,0x5f,0x5f,0xa6,0xa6,0xa6,0xa6,0x2b,0x2b,0xa6,0xa6,0x2b,0x2b,0x2b,0x2b,0x2b,
 0x2b,0x2d,0x2d,0x2b,0x2d,0x2b,0xa6,0xa6,0x2b,0x2b,0x2d,0x2d,0xa6,0x2d,0x2b,0x2d,
 0x2d,0x2d,0x2d,0x2b,0x2b,0x2b,0x2b,0x2b,0x2b,0x2b,0x2b,0x5f,0x5f,0x5f,0x5f,0x5f,
 0xf0,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfe,0xff,
 0xa8,0xb8,0xaa,0xba,0xaf,0xbf,0xa1,0xa2,0xb0,0x95,0xb7,0x5f,0xb9,0xa4,0x5f,0x5f
};
char tblwd[256]={
 0x0,0x1,0x2,0x3,0x4,0x5,0x6,0x7,0x8,0x9,0xa,0xb,0xc,0xd,0xe,0xf,
 0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f,
 0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f,
 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f,
 0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x4b,0x4c,0x4d,0x4e,0x4f,
 0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5a,0x5b,0x5c,0x5d,0x5e,0x5f,
 0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f,
 0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x7b,0x7c,0x7d,0x7e,0x7f,

 0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,
 0x5f,0x5f,0x5f,0x5f,0x5f,0xf9,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,
 0x5f,0xf6,0xf7,0x5f,0xfd,0x5f,0x7c,0x15,0xf0,0x63,0xf2,0x11,0x2d,0x2d,0x72,0xf4,
 0xf8,0x5f,0x49,0x69,0x5f,0x5f,0x14,0xfa,0xf1,0xfc,0xf3,0x10,0x5f,0x5f,0x5f,0xf5,
 0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8a,0x8b,0x8c,0x8d,0x8e,0x8f,
 0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9a,0x9b,0x9c,0x9d,0x9e,0x9f,
 0xa0,0xa1,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7,0xa8,0xa9,0xaa,0xab,0xac,0xad,0xae,0xaf,
 0xe0,0xe1,0xe2,0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,0xeb,0xec,0xed,0xee,0xef
};
char tbl_asc[256]={
 0x0,0x1,0x2,0x3,0x4,0x5,0x6,0x7,0x8,0x9,0xa,0xb,0xc,0xd,0xe,0xf,
 0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f,
 0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f,
 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f,
 0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x4b,0x4c,0x4d,0x4e,0x4f,
 0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5a,0x5b,0x5c,0x5d,0x5e,0x5f,
 0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f,
 0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x7b,0x7c,0x7d,0x7e,0x7f
};
char tbldu[256]={
 0x0,0x1,0x2,0x3,0x4,0x5,0x6,0x7,0x8,0x9,0xa,0xb,0xc,0xd,0xe,0xf,
 0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f,
 0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f,
 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f,
 0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x4b,0x4c,0x4d,0x4e,0x4f,
 0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5a,0x5b,0x5c,0x5d,0x5e,0x5f,
 0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f,
 0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x7b,0x7c,0x7d,0x7e,0x7f,

 0xE1,0xE2,0xF7,0xE7,0xE4,0xE5,0xF6,0xFA,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,
 0xF2,0xF3,0xF4,0xF5,0xE6,0xE8,0xE3,0xFE,0xFB,0xFD,0xFF,0xF9,0xF8,0xFC,0xE0,0xF1,
 0xC1,0xC2,0xD7,0xC7,0xC4,0xC5,0xD6,0xDA,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,
 0x90,0x91,0x92,0x81,0x87,0xB2,0xB4,0xA7,0xA6,0xB5,0xA1,0xA8,0xAE,0xAD,0xAC,0x83,
 0x84,0x89,0x88,0x86,0x80,0x8A,0xAF,0xB0,0xAB,0xA5,0xBB,0xB8,0xB1,0xA0,0xBE,0xB9,
 0xBA,0xB6,0xB7,0xAA,0xA9,0xA2,0xA4,0xBD,0xBC,0x85,0x82,0x8D,0x8C,0x8E,0x8F,0x8B,
 0xD2,0xD3,0xD4,0xD5,0xC6,0xC8,0xC3,0xDE,0xDB,0xDD,0xDF,0xD9,0xD8,0xDC,0xC0,0xD1,
 0xB3,0xA3,0x99,0x98,0x93,0x9B,0x9F,0x97,0x9C,0x95,0x9E,0x96,0xBF,0x9D,0x94,0x9A
};
char tblud[256]={
 0x0,0x1,0x2,0x3,0x4,0x5,0x6,0x7,0x8,0x9,0xa,0xb,0xc,0xd,0xe,0xf,
 0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f,
 0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f,
 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f,
 0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x4b,0x4c,0x4d,0x4e,0x4f,
 0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5a,0x5b,0x5c,0x5d,0x5e,0x5f,
 0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f,
 0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x7b,0x7c,0x7d,0x7e,0x7f,

 0xC4,0xB3,0xDA,0xBF,0xC0,0xD9,0xC3,0xB4,0xC2,0xC1,0xC5,0xDF,0xDC,0xDB,0xDD,0xDE,
 0xB0,0xB1,0xB2,0xF4,0xFE,0xF9,0xFB,0xF7,0xF3,0xF2,0xFF,0xF5,0xF8,0xFD,0xFA,0xF6,
 0xCD,0xBA,0xD5,0xF1,0xD6,0xC9,0xB8,0xB7,0xBB,0xD4,0xD3,0xC8,0xBE,0xBD,0xBC,0xC6,
 0xC7,0xCC,0xB5,0xF0,0xB6,0xB9,0xD1,0xD2,0xCB,0xCF,0xD0,0xCA,0xD8,0xD7,0xCE,0xFC,
 0xEE,0xA0,0xA1,0xE6,0xA4,0xA5,0xE4,0xA3,0xE5,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,
 0xAF,0xEF,0xE0,0xE1,0xE2,0xE3,0xA6,0xA2,0xEC,0xEB,0xA7,0xE8,0xED,0xE9,0xE7,0xEA,
 0x9E,0x80,0x81,0x96,0x84,0x85,0x94,0x83,0x95,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,
 0x8F,0x9F,0x90,0x91,0x92,0x93,0x86,0x82,0x9C,0x9B,0x87,0x98,0x9D,0x99,0x97,0x9A
};
char tbluw[256]={
 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,
 0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,
 0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,
 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3A,0x3B,0x3C,0x3D,0x3E,0x3F,
 0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4A,0x4B,0x4C,0x4D,0x4E,0x4F,
 0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5A,0x5B,0x5C,0x5D,0x5E,0x5F,
 0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6A,0x6B,0x6C,0x6D,0x6E,0x6F,
 0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A,0x7B,0x7C,0x7D,0x7E,0x7F,

 0x2D,0xA6,0x2B,0x2B,0x2B,0x2B,0x2B,0xA6,0x2D,0x2D,0x2B,0x5F,0x5F,0x5F,0x5F,0x5F,
 0x5F,0x5F,0x5F,0xAF,0x5F,0x95,0x5F,0xA2,0xBA,0xAA,0x5F,0xBF,0xB0,0xA4,0xB7,0xA1,
 0x2D,0xA6,0x2B,0xB8,0x2B,0x2B,0x2B,0x2B,0x2B,0x2B,0x2B,0x2B,0x2B,0x2B,0x2B,0xA6,
 0xA6,0xA6,0xA6,0xA8,0xA6,0xA6,0x2D,0x2D,0x2D,0x2D,0x2D,0x2D,0x2B,0x2B,0x2B,0xB9,
 0xFE,0xE0,0xE1,0xF6,0xE4,0xE5,0xF4,0xE3,0xF5,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,
 0xEF,0xFF,0xF0,0xF1,0xF2,0xF3,0xE6,0xE2,0xFC,0xFB,0xE7,0xF8,0xFD,0xF9,0xF7,0xFA,
 0xDE,0xC0,0xC1,0xD6,0xC4,0xC5,0xD4,0xC3,0xD5,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,
 0xCF,0xDF,0xD0,0xD1,0xD2,0xD3,0xC6,0xC2,0xDC,0xDB,0xC7,0xD8,0xDD,0xD9,0xD7,0xDA
};
char tblwu[256]={
 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,
 0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,
 0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,
 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3A,0x3B,0x3C,0x3D,0x3E,0x3F,
 0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4A,0x4B,0x4C,0x4D,0x4E,0x4F,
 0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5A,0x5B,0x5C,0x5D,0x5E,0x5F,
 0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6A,0x6B,0x6C,0x6D,0x6E,0x6F,
 0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A,0x7B,0x7C,0x7D,0x7E,0x7F,

 0x5F,0x5F,0x5F,0x5F,0x5F,0x5F,0x5F,0x5F,0x5F,0x5F,0x5F,0x5F,0x5F,0x5F,0x5F,0x5F,
 0x5F,0x5F,0x5F,0x5F,0x5F,0x95,0x5F,0x5F,0x5F,0x5F,0x5F,0x5F,0x5F,0x5F,0x5F,0x5F,
 0x5F,0x9F,0x97,0x5F,0x9D,0x5F,0x7C,0x15,0xB3,0x63,0x99,0x11,0x2D,0x2D,0x72,0x93,
 0x9C,0x5F,0x49,0x69,0x5F,0x5F,0x14,0x9E,0xA3,0xBF,0x98,0x10,0x5F,0x5F,0x5F,0x9B,
 0xE1,0xE2,0xF7,0xE7,0xE4,0xE5,0xF6,0xFA,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,
 0xF2,0xF3,0xF4,0xF5,0xE6,0xE8,0xE3,0xFE,0xFB,0xFD,0xFF,0xF9,0xF8,0xFC,0xE0,0xF1,
 0xC1,0xC2,0xD7,0xC7,0xC4,0xC5,0xD6,0xDA,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,
 0xD2,0xD3,0xD4,0xD5,0xC6,0xC8,0xC3,0xDE,0xDB,0xDD,0xDF,0xD9,0xD8,0xDC,0xC0,0xD1
};
/*****************/
int convert(unsigned char *buff,unsigned char *Tbl,int count)
 {
 int i;
 for(i=0;i<count;i++)buff[i]=Tbl[(unsigned)buff[i]];
 return 0;
 }
/*****************/
char szHelp[]=
"Text file converter (c)lesha 1998\n"
"Usage:txtconv <options> <srcfile> <dstfile>\n"
"  options: -ud koi8->dos\n"
"           -du dos->koi8\n"
"           -uw koi8->win\n"
"           -wu win->koi8\n"
"           -dw dos->win\n"
"           -wd win->dos\n"
"           -? -This help\n";
int main(int argc,char *argv[])
 {
 FILE *f1;
 FILE *f2;
 char tmpbuff[1024];
 char *xtbl=NULL;
 int nr;
 if((argc>1)&&(strcmp(argv[1],"-?")==0)){printf(szHelp);return 0;}
 if(argc<4){printf(szHelp);return 0;}
 if     (strcmp(argv[1],"-ud")==0)xtbl=tblud;
 else if(strcmp(argv[1],"-du")==0)xtbl=tbldu;
 else if(strcmp(argv[1],"-uw")==0)xtbl=tbluw;
 else if(strcmp(argv[1],"-wu")==0)xtbl=tblwu;
 else if(strcmp(argv[1],"-dw")==0)xtbl=tbldw;
 else if(strcmp(argv[1],"-wd")==0)xtbl=tblwd;
 if(xtbl==NULL){printf("unknown option:%s",argv[1]);return 1;}
 if((f1=fopen(argv[2],"rb"))==NULL){perror(argv[2]);return 1;}
 if((f2=fopen(argv[3],"wb"))==NULL){fclose(f1);perror(argv[3]);return 1;}
 while((nr=fread(tmpbuff,1,sizeof(tmpbuff),f1))>0)
   {
   convert(tmpbuff,xtbl,nr);
   fwrite(tmpbuff,1,nr,f2);
   }
 fclose(f1);
 fclose(f2);
 return 0;
 }
Это еще одна утилита,соторая поможет вам в тяжелой реальности Интернета ;). Скомпилить ее можно под все три системы и используется она после этого очень легко, особенно когда всегда под рукой.
В общем что я могу сказать ,у вас на пути будет немало трудностей, но их можно всех преодолеть используя нехитрые приспособления.
Желаю вам удачи. А пока посмотрите на некоторые примеры приложений, возможно они вам будут полезны.


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