Format specifier for sscanf() in C Post: 303040850

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Top Forums Programming Format specifier for sscanf() in C Post 303040850 by MadeInGermany on Thursday 7th of November 2019 04:56:40 PM

11-07-2019

Registered User

BTW in many cases a trim function comes in handy.
For example, the fuzzy strstr() that can match a portion of the string can be replaced with an exact strcmp()

Code:

...
// http://www.martinbroadhurst.com/trim-a-string-in-c.html
char *rtrim(char *str, const char *seps)
{
    int i;
    if (seps == NULL) {
        seps = "\t\n\v\f\r ";
    }
    i = strlen(str) - 1;
    while (i >= 0 && strchr(seps, str[i]) != NULL) {
        str[i] = '\0';
        i--;
    }
    return str;
}

int main (int argc, char *argv[])
{
    char line[512];      //for row read from file
    char name[32];      //1st part (key part) parsed from each line[]
    char str1[12];       //2nd part (value part) parsed from each line[]

    FILE* fPtr = fopen(argv[1], "r");
    RECORD record[16];            //test file may have 288 ~ 306 rows including blank lines
    static int i = -1;               //initialize counter

    while (fgets(line, sizeof(line), fPtr) != NULL) {
        if ( line[0] == '\n' ) continue;        //skip "blank" lines with e.g. empty or invisible spaces(to be improved!).
        str1[0]='\0';
        sscanf(line, "%[^:] : %s", name, str1);   
        rtrim(name, NULL);             //strip the trailing spaces
        if (strcmp(name, "Sample Name") == 0) {
            i++;
            strcpy(record[i].ID, str1);
            printf("\n");
        }
...

Note that the variable i in the rtrim() is local to the function, does not conflict with the variable i in main()

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LEARN ABOUT PHP

rtrim

RTRIM(3)								 1								  RTRIM(3)

rtrim - Strip whitespace (or other characters) from the end of a string

SYNOPSIS

       string rtrim (string  $str, [string  $character_mask])

DESCRIPTION

	This function returns a string with whitespace stripped from the end of $str.

	Without the second parameter, rtrim(3) will strip these characters:

	      o " " (ASCII
		32 ( 0x20)), an ordinary space.

	      o "	" (ASCII
		9 ( 0x09)), a tab.

	      o "
" (ASCII
		10 ( 0x0A)), a new line (line feed).

	      o "
" (ASCII
		13 ( 0x0D)), a carriage return.

	      o "" (ASCII
		0 ( 0x00)), the NULL-byte.

	      o "x0B" (ASCII
		11 ( 0x0B)), a vertical tab.

PARAMETERS

	      o $str
		- The input string.

	      o $character_mask
		-  You	can  also  specify the characters you want to strip, by means of the $character_mask parameter. Simply list all characters
		that you want to be stripped. With .. you can specify a range of characters.

RETURN VALUES

	Returns the modified string.

EXAMPLES

       Example #1

	      Usage example of rtrim(3)

	      <?php

	      $text = "		These are a few words :) ...  ";
	      $binary = "x09Example stringx0A";
	      $hello  = "Hello World";
	      var_dump($text, $binary, $hello);

	      print "
";

	      $trimmed = rtrim($text);
	      var_dump($trimmed);

	      $trimmed = rtrim($text, " 	.");
	      var_dump($trimmed);

	      $trimmed = rtrim($hello, "Hdle");
	      var_dump($trimmed);

	      // trim the ASCII control characters at the end of $binary
	      // (from 0 to 31 inclusive)
	      $clean = rtrim($binary, "x00..x1F");
	      var_dump($clean);

	      ?>

	      The above example will output:

	      string(32) "	  These are a few words :) ...	"
	      string(16) "    Example string
	      "
	      string(11) "Hello World"

	      string(30) "	  These are a few words :) ..."
	      string(26) "	  These are a few words :)"
	      string(9) "Hello Wor"
	      string(15) "    Example string"

SEE ALSO

       trim(3), ltrim(3).

PHP Documentation Group 														  RTRIM(3)

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