HP SunSoft Pascal 4.0 Bedienungsanleitung PDF herunterladen (Seite 144)

100

101

120 Pascal 4.0 User’s Guide

Avoid constructs that rely on strings being in static variable storage. For

example, you could use mktemp(3) in Pascal as follows:

This use is incorrect, since mktemp()modiﬁes its argument. Instead, use the C

library routine strncpy() (see string(3)) to copy the string constant to a

declared char array variable, as in:

The commands to compile and

execute StrVar.c and

StrVarMain.p

hostname% cc -c StrVar.c

hostname% pc StrVar.o StrVarMain.p

hostname% a.out

abcdefghij

abcdefghijklmnopqrtstuvwxyz

varstr

length(v) = 6

Incorrect use of string in static

variable storage

tmp := mktemp('/tmp/eph.xxxxxx')

Correct solution using the C

library routine strncpy()

program Use_mktemp ;

procedure strncpy( var dest: univ string ;

var srce: univ string ;

length: integer) ; external c ;

procedure mktemp(var dest: univ string); external c;

...

var path: string ;

begin

...

strncpy( path, '/tmp/eph.xxxxxx', sizeof(path)) ;

mktemp( path ) ;

...

end .

1 2 ... 139 140 141 142 143 144 145 146 147 148 149 ... 332 333

Kommentare zu diesen Handbüchern

Keine Kommentare

HP SunSoft Pascal 4.0 Bedienungsanleitung Seite 144

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Software HP SunSoft Pascal 4.0