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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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DtDtsFileToAttributeValue(library call) 								   DtDtsFileToAttributeValue(library call)

NAME
DtDtsFileToAttributeValue -- get a specified attribute value for a file SYNOPSIS
#include <Dt/Dts.h> char *DtDtsFileToAttributeValue( const char *filepath, const char *attr_name); DESCRIPTION
The DtDtsFileToAttributeValue function returns a data attribute value for the specified file. The filepath argument is the pathname of the file. The attr_name argument is a pointer to an attribute name string. RETURN VALUE
Upon successful completion, the DtDtsFileToAttributeValue function returns a pointer to a data attribute value string, or NULL if no value could be determined. APPLICATION USAGE
The application should use the DtDtsFreeAttributeValue(3) function to release the memory for the returned value. EXAMPLES
The following takes a list of files as arguments and determines the description of the data type for each file: #include <Dt/Dts.h> #define ATTRIBUTE "DESCRIPTION" main (int argc, char **argv) { char *attribute; /* load data types database */ DtDtsLoadDataTypes(); argv++; while (*argv) { /* get attribute for file */ attribute = DtDtsFileToAttributeValue(*argv, ATTRIBUTE); if (attribute) printf("%s: %s ", *argv, attribute); argv++; } DtDtsRelease(); exit(0); } SEE ALSO
Dt/Dts.h, DtDtsLoadDataTypes(3), DtDtsRelease(3), DtDtsFreeAttributeValue(3). DtDtsFileToAttributeValue(library call)
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