GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
Unix |
Unix v6 |
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getc(3) |
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getc, getw, fopen buffered input mov $filename,r0
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jsr |
r5,fopen; iobuf fopen(filename, iobuf) |
char *filename;
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struct buf *iobuf; jsr |
r5,getc; iobuf |
(character in r0) getc(iobuf)
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struct buf *iobuf; jsr |
r5,getw; iobuf |
(word in r0) getw(iobuf)
struct buf *iobuf; These routines provide a buffered
input facility. is the address of a 518(10) byte buffer area
whose contents are maintained by these routines. Its
structure is
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struct buf { |
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int fildes; |
/* File descriptor */ |
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int nleft; |
/* Chars left in buffer */ |
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char *nextp; |
/* Ptr to next character */ |
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char buff[512]; |
/* The buffer */ |
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}; |
may be called initially to open the file. On return, the error bit (c-bit) is set if the open failed. If fopen is never called, get will read from the standard input file. From C, the value is negative if the open failed. returns the next byte from the file in r0. The error bit is set on end of file or a read error. From C, the character is returned as an integer, without sign extension; it is 1 on end-of-file or error. Getw returns the next word in r0. and getw may be used alternately; there are no odd/even problems. Getw is may be called from C; 1 is returned on end-of-file or error, but of course is also a legitimate value. must be provided by the user; it must be on a word boundary. To reuse the same buffer for another file, it is sufficient to close the original file and call fopen again. open (II), read (II), getchar (III), putc (III) c-bit set on EOF or error; from C, negative return indicates error or EOF. Moreover, is set by this routine just as it is for a system call (see introduction (II)).
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getc(3) | |