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dev_lpt_test.bas
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dev_lpt_test.bas
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/' LPTx device '/
#include "fb.bi"
#include "crt\ctype.bi"
/' Tests for the right file name for LPT access.
*
* Allowed file names are:
*
* - PRN:
* - LPT:
* - LPTx: with x>=1
* - LPT:printer_name,EMU=?,TITLE=?,OPT=?, ...
'/
extern "C"
function fb_DevLptParseProtocol( lpt_proto_out as DEV_LPT_PROTOCOL ptr ptr, proto_raw as const ubyte ptr, proto_raw_len as size_t, subst_prn as long ) as long
dim as ubyte ptr p, ptail, pc, pe
dim as DEV_LPT_PROTOCOL ptr lpt_proto
if ( proto_raw = NULL ) then
return FALSE
end if
if ( lpt_proto_out = NULL ) then
return FALSE
end if
*lpt_proto_out = calloc( sizeof( DEV_LPT_PROTOCOL ) + proto_raw_len + 2, 1 )
lpt_proto = *lpt_proto_out
if ( lpt_proto = NULL ) then
return FALSE
end if
strncpy( lpt_proto->raw, proto_raw, proto_raw_len )
lpt_proto->raw[proto_raw_len] = 0
p = lpt_proto->raw
ptail = p + strlen( lpt_proto->raw )
lpt_proto->iPort = 0
lpt_proto->proto = ptail
lpt_proto->name = ptail
lpt_proto->title = ptail
lpt_proto->emu = ptail
/' "PRN:" '/
if ( strcasecmp( p, "PRN:" ) = 0) then
if ( subst_prn <> 0 ) then
strcpy( p, "LPT1:" )
end if
lpt_proto->proto = p
lpt_proto->iPort = 1
return TRUE
end if
/' "LPTx:" '/
if ( strncasecmp( p, "LPT", 3) <> 0) then
return FALSE
end if
pc = strchr( p, asc(":") )
if ( pc = 0 ) then
return FALSE
end if
lpt_proto->proto = p
p = pc + 1
*pc = 0
pc -= 1
/' Get port number if any '/
while ( *pc >= asc("0") and *pc <= asc("9") )
pc -= 1
wend
pc += 1
lpt_proto->iPort = atoi( pc )
/' Name, TITLE=?, EMU=? '/
while( *p )
if ( isspace( *p ) <> 0 orelse *p = asc(",") ) then
p += 1
else
dim as ubyte ptr pt
pe = strchr(p, asc("="))
pc = strchr(p, asc(","))
if ( pc <> 0 andalso pe > pc ) then
pe = NULL
end if
if ( pe = 0 ) then
lpt_proto->name = p
else
/' remove spaces before '=' '/
pt = pe - 1
while( isspace( *pt ) <> 0 )
*pt = 0
pt -= 1
wend
/' remove spaces after '=' or end '/
pe[1] = 0
while( isspace( *pe ) <> 0 )
*pe = 0
pe += 1
wend
if( strcasecmp( p, "EMU" ) = 0) then
lpt_proto->emu = pe
elseif ( strcasecmp( p, "TITLE" ) = 0) then
lpt_proto->title = pe
end if
/' just ignore options we don't understand to allow forward compatibility '/
end if
/' remove spaces before ',' or end '/
pt = iif(pc <> 0, pc, ptail)
pt -= 1
while( isspace( *pt ) <> 0 )
*pt = 0
pt -= 1
wend
if ( pc <> 0 ) then
p = pc + 1
*pc = 0
else
p = ptail
end if
end if
wend
return TRUE
end function
function fb_DevLptTestProtocol( handle as FB_FILE ptr, filename as const ubyte ptr, filename_len as size_t ) as long
dim as DEV_LPT_PROTOCOL ptr lpt_proto
dim as long ret = fb_DevLptParseProtocol( @lpt_proto, filename, filename_len, FALSE )
free( lpt_proto )
return ret
end function
end extern