136 lines
2.6 KiB
C
136 lines
2.6 KiB
C
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/**
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* StripLines - strips a text file (usually a Makefile) of
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* Microsoft-proprietary or other specialized parts
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*
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* Programmed by Steve Salisbury, Thu 18 May 1995
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*
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* Fri 19 May 1995 -- add code to skips lines containing STRIPLIN!
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* Add line numbers to diagnostic messages
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* Flag redundant STRIPLIN= directives (which are an error)
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*
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* This program just copies stdin to stdout. Depending on the
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* value of a global state variable, some lines may be ignored.
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*
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* ... STRIPLIN=0 ...
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* turns off line-by-line copying until STRIPLIN=1 or STRIPLIN=2
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* is encountered, at which point lines will be copied again.
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* ... STRIPLIN=1 ...
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* turns on line-by-line copying (initial state)
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* ... STRIPLIN=2 ...
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* turns on line-by-line copying with deletion of
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* initial # on each line (if there is one). If
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* an input line has no initial #, it is copied as-is.
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* ... STRIPLIN! ...
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* this single line is not copied (regardless of the 0/1/2 state)
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**/
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/**
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*
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* Header Files
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*
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**/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/**
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*
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* Global Constants
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*
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**/
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#define MAXLINELEN 4096
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/**
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*
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* Global Variables
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*
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**/
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char InputLine [ MAXLINELEN ] ;
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char ControlString[ ] = "STRIPLIN=" ;
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char DeleteString[ ] = "STRIPLIN!" ;
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/**
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*
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* Function Declarations (Prototypes)
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*
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**/
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int main ( int argc , char * argv [ ] ) ;
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/**
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*
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* Function Definitions (Implementations)
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*
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**/
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int main ( int argc , char * argv [ ] )
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{
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int StateFlag = 1 ;
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int LineNumber = 0 ;
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while ( fgets ( InputLine , sizeof ( InputLine ) , stdin ) )
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{
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char * pString ;
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++ LineNumber ;
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if ( pString = strstr ( InputLine , ControlString ) )
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{
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int NewStateFlag ;
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NewStateFlag = pString [ strlen ( ControlString ) ] - '0' ;
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if ( NewStateFlag < 0 || 2 < NewStateFlag )
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{
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fprintf ( stderr , "striplin: invalid directive:\n%d:\t%s\n" ,
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LineNumber , InputLine ) ;
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exit ( 1 ) ;
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}
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if ( NewStateFlag == StateFlag )
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{
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fprintf ( stderr , "striplin: redundant directive:\n%d:\t%s\n" ,
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LineNumber , InputLine ) ;
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exit ( 1 ) ;
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}
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StateFlag = NewStateFlag ;
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}
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else if ( StateFlag != 0 )
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{
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char * start = InputLine ;
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/*-
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* If StateFlag is 2 and the line begins with #, skip the #
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-*/
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if ( StateFlag == 2 && * start == '#' )
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start ++ ;
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/*-
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* Echo lines that do not contain the delete string
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-*/
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if ( ! strstr ( start , DeleteString ) )
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fputs ( start , stdout ) ;
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}
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}
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if ( fflush ( stdout ) )
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{
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fprintf ( stderr , "striplin: Error flushing standard output\n" ) ;
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exit ( 1 ) ;
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}
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return 0 ;
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}
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