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Full Discussion: help with string slicing in C
Top Forums Programming help with string slicing in C Post 302510824 by gaurav1086 on Tuesday 5th of April 2011 05:38:38 AM
Old 04-05-2011
Bug
Quote:
Originally Posted by achenle
Smilie Calling "free(p)" after "p+=start" will corrupt the heap.

My shot:

Code:
char *shift( char *str, size_t count )
{
    size_t len;

    if ( NULL == str )
    {
        return( NULL );
    }

    len = strlen( str );
    if ( len > count )
    {
        return( NULL );
    }

    memmove( str, str + cpunt, len - count + 1 );

    return( str );
}

should be
Code:
 if (count > len)

Thanks,
Gaurav.

---------- Post updated at 03:08 PM ---------- Previous update was at 02:57 PM ----------
Another way ,

Code:
 void * shiftbyn( char *str, size_t count )
{
    size_t len = 0;
    char *newstr = NULL;

    if ( NULL == str )
    {
        return NULL;
    }

    len = strlen( str );
    if ( count > len )
    {
        return NULL;
    }

    newstr = malloc (strlen(str) - count);
    strcpy (newstr, str + count);
    free (str); str = NULL;
    return newstr;
}

Thanks,
Gaurav.
 

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LEARN ABOUT CENTOS

qrencode

QRENCODE(1)						      General Commands Manual						       QRENCODE(1)

NAME

       qrencode - Encode input data in a QR Code and save as a PNG or EPS image.

SYNOPSIS

       qrencode [OPTION]...  [STRING]

DESCRIPTION

       Libqrencode  is	a  library  for encoding data in a QR Code symbol, a kind of 2D symbology that can be scanned by handy terminals such as a
       mobile phone with CCD. The capacity of QR Code is up to 7000 digits or 4000 characters, and has high robustness.

       Qrencode is a utility software using libqrencode to encode string data in a QR Code and save as a PNG or EPS image.

OPTIONS

       -h, --help
	      display help message.

       -o FILENAME, --output=FILENAME
	      write image to FILENAME. If '-' is specified, the result will be output to standard output. If -S is given, structured  symbols  are
	      written to FILENAME-01.png, FILENAME-02.png, ... (suffix is removed from FILENAME, if specified)

       -s NUMBER, --size=NUMBER
	      specify the size of dot (pixel). (default=3)

       -l {LMQH}, --level={LMQH}
	      specify error collectin level from L (lowest) to H (highest). (default=L)

       -v NUMBER, --symversion=NUMBER
	      specify the version of the symbol. (default=auto)

       -m NUMBER, --margin=NUMBER
	      specify the width of margin. (default=4)

       -d NUMBER, --dpi=NUMBER
	      specify the DPI of the generated PNG. (default=72)

       -t {PNG,EPS,SVG,ANSI,ANSI256,ASCII,ASCIIi,UTF8,ANSIUTF8}
       --type={PNG,EPS,SVG,ANSI,ANSI256,ASCII,ASCIIi,UTF8,ANSIUTF8}
	      specify the type of the generated image. (default=PNG)

       -S, --structured
	      make structured symbols. Version must be specified.

       -k, --kanji
	      assume that the input text contains kanji (shift-jis).

       -c, --casesensitive
	      encode lower-case alphabet characters in 8-bit mode. (default)

       -i, --ignorecase
	      ignore case distinctions and use only upper-case characters.

       -8, --8bit
	      encode entire data in 8-bit mode. -k, -c and -i will be ignored.

       -M, --micro
	      encode in a Micro QR Code. (experimental)

       --foreground=RRGGBB[AA]
       --background=RRGGBB[AA]
	      specify foreground/background color in hexadecimal notation.  6-digit (RGB) or 8-digit (RGBA) form are supported.  Color output sup-
	      port available only in PNG and SVG.

       -V, --version
	      display the version number and copyrights of the qrencode.

       [STRING]
	      input data. If it is not specified, data will be taken from standard input.

EXAMPLES

       qrencode -l L -v 1 -o output.png 'Hello, world!'
	      encode into a symbol version 1, level L.

       qrencode -iSv 1 --output=output.png
	      read standard input and encode it into a structured-appended symbols in case-insensitive mode.

AUTHOR

       Written by Kentaro Fukuchi.

RESOURCES

       Main Web Site: http://fukuchi.org/works/qrencode/

       Source code repository: https://github.com/fukuchi/libqrencode/

COPYRIGHT

       Copyright (C) 2006-2012 Kentaro Fukuchi.

qrencode 3.4.1							   Oct. 9, 2012 						       QRENCODE(1)
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