C Language, Newbie question about fgets() Function

Newbie question about fgets() Function

Author	Message
Ted Bang #1 / 4	Newbie question about fgets() Function A newbie question: The way I _want_ fgets() to work is for it to read until n-1 characters are transfered to the input buffer or until it encounters a newline (i.e., CR-LF), in which case it captures the newline. I'm happy to replace the CR with a NULL to form a proper string. The way it _is_ working is that it reads the stream until it sees the newline, but then places (get ready for it) a LF-NULL combination in the buffer. That's right, a hex 0D-00. Huh? By the way, this is Borland C++ v4.5. Anybody know what's going on? E-mail, please. TIA.
Tue, 12 May 1998 03:00:00 GMT

P.Benne #2 / 4	Newbie question about fgets() Function Quote: >A newbie question: >The way I _want_ fgets() to work is for it to read until n-1 characters >are transfered to the input buffer or until it encounters a newline >(i.e., CR-LF), in which case it captures the newline. I'm happy to >replace the CR with a NULL to form a proper string. >The way it _is_ working is that it reads the stream until it sees the >newline, but then places (get ready for it) a LF-NULL combination in the >buffer. That's right, a hex 0D-00. Huh? Yes, this is the correct operation. Within C, a newline (\n) is a LF alone. If a stream is opened in text mode, the C I/O library _will_ convert the C newline char to the operating system's representation, on output, and from the operating system's representation to \n on input. If you _really_ want to see the CR/LF chars that DOS uses, you have to open the stream in binary mode. Peter Bennett VE7CEI \| Vessels shall be deemed to be in sight TRIUMF, Vancouver, B.C., Canada \| ColRegs 3(k) GPS and NMEA info and programs: ftp://sundae.triumf.ca/pub/peter/index.html
Tue, 12 May 1998 03:00:00 GMT

Lawrence Kirb #3 / 4	Newbie question about fgets() Function Quote: >A newbie question: >The way I _want_ fgets() to work is for it to read until n-1 characters >are transfered to the input buffer or until it encounters a newline >(i.e., CR-LF), in which case it captures the newline. I'm happy to >replace the CR with a NULL to form a proper string. Within C lines are by definition terminated with a linefeed (ASCII value 10) character. If the file is opened in text more the library will convert automatically between the system's line convention and this convention. Thus if you are using a system that uses CR-LF to terminate a line the library will convert all instances of these to plain LF with input from a file opened in text mode. Quote: >The way it _is_ working is that it reads the stream until it sees the >newline, but then places (get ready for it) a LF-NULL combination in the >buffer. That's right, a hex 0D-00. Huh? This looks confused. LF is a linefeed with value 10 (0x0a) in ASCII, CR is a carriage return with ASCII value 13 (0x0d). What do you actually see? -- ----------------------------------------- -----------------------------------------
Tue, 12 May 1998 03:00:00 GMT

Mark Brad #4 / 4	Newbie question about fgets() Function Quote: > Within C lines are by definition terminated with a linefeed (ASCII > value 10) character. He means, of course: ... terminated with a linefeed character (value 10 if the execution character set is ASCII). The execution character set is implementation-defined, though the standard does impose some requirements on it. -- Mark Brader \| "I don't care HOW you format char c; while ((c = SoftQuad Inc., Toronto \| bug waiting to happen from the outset." --Doug Gwyn My text in this article is in the public domain.
Thu, 14 May 1998 03:00:00 GMT

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