The Tor Browser: security/nss/cmd/modutil/installparse.l@7e26c7da4463

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 /* lex file for analyzing PKCS #11 Module installation instructions */

     8 /*----------------------------- Definitions ---------------------------*/

     9 %{

    10 #include <string.h>

    12 #include "install-ds.h"		/* defines tokens and data structures */

    13 #include "installparse.h"	/* produced by yacc -d */

    14 #include <prprf.h>

    15 static char *putSimpleString(char*);	/* return copy of string */

    16 static char *putComplexString(char*);	/* strip out quotes, deal with */

    17 											/* escaped characters */

    19 void Pk11Install_yyerror(char *);

    21 /* Overrides to use NSPR */

    22 #define malloc PR_Malloc

    23 #define realloc PR_Realloc

    24 #define free PR_Free

    26 int Pk11Install_yylinenum=1;

    27 static char *err;

    29 #define YY_NEVER_INTERACTIVE 1

    30 #define yyunput Pkcs11Install_yyunput

    32 /* This is the default YY_INPUT modified for NSPR */

    33 #define YY_INPUT(buf,result,max_size) \

    34 	if ( yy_current_buffer->yy_is_interactive ) { \

    35 		char c; \

    36 		int n; \

    37 		for ( n = 0; n < max_size && \

    38 		  PR_Read(Pk11Install_FD, &c, 1)==1 && c != '\n'; ++n ) { \

    39 			buf[n] = c; \

    40 		} \

    41         if ( c == '\n' ) { \

    42             buf[n++] = c; \

    43 		} \

    44         result = n; \

    45 	} else { \

    46 		result = PR_Read(Pk11Install_FD, buf, max_size); \

    47 	}

    49 %}

    51 /*** Regular expression definitions ***/

    52 /* simple_string has no whitespace, quotes, or braces */

    53 simple_string		[^ \t\r\n\""{""}"]+

    55 /* complex_string is enclosed in quotes. Inside the quotes, quotes and

    56    backslashes must be backslash-escaped. No newlines or carriage returns

    57    are allowed inside the quotes. Otherwise, anything goes. */

    58 complex_string		\"([^\"\\\r\n]|(\\\")|(\\\\))+\"

    60 /* Standard whitespace */

    61 whitespace			[ \t\r]+

    63 other				.

    65 /*---------------------------- Actions --------------------------------*/

    66 %%

    68 "{"					return OPENBRACE;

    69 "}"					return CLOSEBRACE;

    70 {simple_string}		{Pk11Install_yylval.string =

    71 						putSimpleString(Pk11Install_yytext);

    72 						return STRING;}

    73 {complex_string}	{Pk11Install_yylval.string =

    74 						putComplexString(Pk11Install_yytext);

    75 						return STRING;}

    77 "\n"				Pk11Install_yylinenum++;

    79 {whitespace}		;

    81 {other}				{err = PR_smprintf("Invalid lexeme: %s",Pk11Install_yytext);

    82 						Pk11Install_yyerror(err);

    83 						PR_smprintf_free(err);

    84 						return 1;

    85 					}

    87 %%

    88 /*------------------------ Program Section ----------------------------*/

    90 PRFileDesc *Pk11Install_FD=NULL;

    92 /*************************************************************************/

    93 /* dummy function required by lex */

    94 int Pk11Install_yywrap(void) { return 1;}

    96 /*************************************************************************/

    97 /* Return a copy of the given string */

    98 static char*

    99 putSimpleString(char *str)

   100 {

   101 	char *tmp = (char*) PR_Malloc(strlen(str)+1);

   102 	strcpy(tmp, str);

   103 	return tmp;

   104 }

   106 /*************************************************************************/

   107 /* Strip out quotes, replace escaped characters with what they stand for.

   108    This function assumes that what is passed in is actually a complex

   109    string, so error checking is lax. */

   110 static char*

   111 putComplexString(char *str)

   112 {

   113 	int size, i,j;

   114 	char *tmp;

   116 	if(!str) {

   117 		return NULL;

   118 	}

   119 	size = strlen(str);

   121 	/* Allocate the new space.  This string will actually be too big,

   122 		since quotes and backslashes will be stripped out.  But that's ok. */

   123 	tmp = (char*) PR_Malloc(size+1);

   125 	/* Copy it over */

   126 	for(i=0, j=0; i < size; i++) {

   127 		if(str[i]=='\"') {

   128 			continue;  /* skip un-escaped quotes */

   129 		} else if(str[i]=='\\') {

   130 			++i;       /* escaped character. skip the backslash */

   131 		}

   132 		tmp[j++] = str[i];

   133 	}

   134 	tmp[j] = '\0';

   136 	return tmp;

   137 }

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