/***************************************************************************
 * strings.c:	Miscellaneous string functions.
 *
 * Part of...
 *
 *	FREE:	Display free space on your disk volumes.
 *		Author:  Daniel J. Barrett, barrett@cs.umass.edu.
 *
 * This program is Freely Distributable.  Make all the copies you want
 * and give them away.  Use this code in any way you like.
***************************************************************************/

#include "free.h"

/* Compare two strings, ignoring the difference between upper/lower case.
 * If the strings are the same, return 0; else, return 1. */

int StrCaseCmp(char *s1, char *s2)
{
	while (*s1 && *s2)
	{
		if (toupper(*s1) != toupper(*s2))
			return(1);	/* Different. */
		s1++, s2++;
	}
	return(0);			/* Same. */
}


/* This is a safe method for concatenating string "src" onto the end of
 * string "dest".  If dest does not have enough room to fit "src", an
 * error routine is called, and FALSE is returned.  Otherwise, the
 * concatenation takes place, and TRUE is returned.
 *
 * The flag "ok" is static.  When one error sets "ok" to FALSE, we never
 * need to run this function anymore. */

int Concat(char dest[], char src[])
{
	static int ok = TRUE;
	int destLen;

	if (ok)
	{
		destLen = strlen(dest);
		if (destLen + strlen(src) <  memSize)	/* memSize global. */
			strcat(dest, src);
		else
		{
			ErrorMsg(ERROR_TOO_SMALL);
			if (destLen > 0)
				dest[destLen-1] = '\n';
			else
				dest[0] = '\0';
			ok = FALSE;
		}
	}
}


/* Create an array of size memSize and return a pointer to it.  We also
 * copy the empty string into the array, in preparation for later
 * strcat() calls. */
	
char *MakeOutArray(void)
{
	char *arr;

	/* Note that memSize is global, and set by GetOptions. */

	if ((memSize <= 0) || !(arr = (char *)malloc(memSize)))
		ExitCleanly(ERROR_CANT_MALLOC, RETURN_FAIL);
	else
		arr[0] = '\0';

	return(arr);
}


/* We turn "format[]" into a format string suitable for printf().
 * We create this format string because we want proper indenting of
 * all our output.  The key value to watch is the %d value, which is
 * calculated using the length of the volume name and the default spacing.
 * We set "d_or_s" to be 'd' or 's', depending on whether we want a
 * decimal field or a string field to be last in the format string.
 * We pass "cr" as TRUE if we want a carriage return (really a newline)
 * at the end of the format string. */

void MakeFormatString(char *volume, char format[], char d_or_s, int cr)
{
	char metaFormat[FORMAT_LENGTH];

	if (d_or_s == 'd')
		strcpy(metaFormat, "%%s%%s%%s%%%dld%s");
	else if (d_or_s == 's')
		strcpy(metaFormat, "%%s%%s%%s%%%ds%s");
	else
		ErrorMsg(ERROR_IMPOSSIBLE);

	/* volumeNameLen is global and set in InitializeGlobals() or
	 * GetOptions(). */

	sprintf(format, metaFormat, 
		DEFAULT_SPACING + volumeNameLen - strlen(volume),
		cr ? "\n" : "");
}