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Full Discussion: C. To segmentation fault or not to segmentation fault, that is the question.
Top Forums Programming C. To segmentation fault or not to segmentation fault, that is the question. Post 303032356 by Corona688 on Friday 15th of March 2019 02:31:43 PM
Old 03-15-2019
It crashes when you overrun the end of argv[].

Code:
int main(int argc, char *argv[])
{
    int NUM_1 = strtod(argv[1], NULL); // Does argv[1] exist?  If not, crash.
    int NUM_2 = strtod(argv[3], NULL); // Does argv[3] exist?  If not, crash.
    CHARACTER = *argv[2]; // Does argv[2] exist?  If not, crash.

    /* Conditional AFTER _variables_! */
    if (argc <= 3)
    {
        printf("ERROR!\n\n");
        printf("Not enough arguments!\n");
        exit(1);
    }

    printf("\n%i, %i, %c\n\n", NUM_1, NUM_2, CHARACTER);

    return(0);
}

The system is actually supposed to crash when you do this, rather than let you get away with mangling data outside of bounds, but some systems are better at catching it than others.
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LEARN ABOUT DEBIAN

djvu2hocr

DJVU2HOCR(1)							 djvu2hocr manual						      DJVU2HOCR(1)

NAME

       djvu2hocr - DjVu to hOCR converter

SYNOPSIS

       djvu2hocr [option...] djvu-file

       djvu2hocr {--version | --help | -h}

DESCRIPTION

       djvu2hocr converts hidden text from a DjVu file to the hOCR[1] format.

OPTIONS

   Text segmentation options
       --word-segmentation=simple
	   Use the same word segmentation as found in the DjVu file.

	   This is the default.

       --word-segmentation=uax29
	   Use the Unicode Text Segmentation[2] algorithm to break lines into words, possibly fixing word segmentation found in the DjVu file.

   Other options
       --version
	   Output version information and exit.

       -h, --help
	   Display help and exit.

PORTABILITY

       djvu2hocr uses a custom extension to hOCR to retain characters which cannot be directly represented in an HTML/XML document. For example,
       control character BEL (^G, U+0007), is converted into the following HTML chunk: <span class="djvu_char" title="#x07"> </span>

SEE ALSO

       djvu(1)

AUTHOR

       Jakub Wilk <jwilk@jwilk.net>
	   Author.

NOTES

	1. hOCR
	   http://docs.google.com/View?docid=dfxcv4vc_67g844kf

	2. Unicode Text Segmentation
	   http://unicode.org/reports/tr29/

djvu2hocr 0.7.9 						    03/10/2012							      DJVU2HOCR(1)
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