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Full Discussion: fgets problems
Top Forums Programming fgets problems Post 302397207 by achenle on Sunday 21st of February 2010 10:49:56 AM
Old 02-21-2010
Let me get this straight: you have a custom memory management library, and your code using that library crashes?

OK.

You need all the help you can get. But there's not much out there.

Your only hope is to do something like download a demo copy of Purify and use it. And then pray that you don't have any bugs in your custom library.

And good luck.

You're going to need it.

There's a reason why nobody writes their own memory management libraries. First off, the multiple libraries available for free on your OS of choice are almost certainly fast enough. If they're not, you're most likely doing something wrong, like an over-reliance on malloc()/free() and/or new/delete. And if the OS libaries truly aren't fast enough (and if you're not multithreaded on a massively parallel application, they ARE fast enough!), there are third-party memory management libraries available.

Go price something like Smartheap. Then calculate all the hours spent on your custom memory library and how much those hours cost. Want to bet Smartheap is cheaper? If you even need it in the first place.

There are probably literally thousands of man-years invested by many absolutely brilliant computer scientists and programmers in all the memory-management libraries available in today's operating systems. And those products have been thoroughly tested - for literally decades.

You want a car analogy? Writing your own memory management library is like chiseling out a stone wheel for a sports car. The only reason to do it is for the sake of doing it - as a hobby or academic learning experience. Because there's no way you can duplicate the engineering history behind a "normal" wheel. Even if you do manage to chisel out a wheel that manages to outperform a "normal" wheel in a tiny operating range, you'll never really know how durable your wheel is because it's totally untested.
 

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gets(3C)						   Standard C Library Functions 						  gets(3C)

NAME
gets, fgets - get a string from a stream SYNOPSIS
#include <stdio.h> char *gets(char *s); char *fgets(char *s, int n, FILE *stream); DESCRIPTION
The gets() function reads bytes from the standard input stream (see intro(3)), stdin, into the array pointed to by s, until a newline char- acter is read or an end-of-file condition is encountered. The newline character is discarded and the string is terminated with a null byte. If the length of an input line exceeds the size of s, indeterminate behavior may result. For this reason, it is strongly recommended that gets() be avoided in favor of fgets(). The fgets() function reads bytes from the stream into the array pointed to by s, until n-1 bytes are read, or a newline character is read and transferred to s, or an end-of-file condition is encountered. The string is then terminated with a null byte. The fgets() and gets() functions may mark the st_atime field of the file associated with stream for update. The st_atime field will be marked for update by the first successful execution of fgetc(3C), fgets(), fread(3C), fscanf(3C), getc(3C), getchar(3C), gets(), or scanf(3C) using stream that returns data not supplied by a prior call to ungetc(3C) or ungetwc(3C). RETURN VALUES
If end-of-file is encountered and no bytes have been read, no bytes are transferred to s and a null pointer is returned. For standard-con- forming (see standards(5)) applications, if the end-of-file indicator for the stream is set, no bytes are transferred to s and a null pointer is returned whether or not the stream is at end-of-file. If a read error occurs, such as trying to use these functions on a file that has not been opened for reading, a null pointer is returned and the error indicator for the stream is set. If end-of-file is encoun- tered, the EOF indicator for the stream is set. Otherwise s is returned. ERRORS
Refer to fgetc(3C). ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
lseek(2), read(2), ferror(3C), fgetc(3C), fgetwc(3C), fopen(3C), fread(3C), getchar(3C), scanf(3C), stdio(3C), ungetc(3C), ungetwc(3C), attributes(5), standards(5) SunOS 5.10 15 Oct 2003 gets(3C)
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