Geografic-Information-System/raster/r.report/format.c

/***************************************************
 * these routines determine the printf format used
 * by floating point values
 *
 * format_parms() is called for each value.
 *     before first call set eformat=0,dp=6
 *
 * format_double() does the formating with the
 *     parms determined by format_parms()
 ***************************************************/
#include <string.h>
#include "global.h"

int format_parms(double v, int *n, int *dp, int *eformat, int e_option)
{
    char buf[50];
    int orig_length, scient_dp;

    orig_length = *n;
    scient_dp = *dp;
    for (;;) {
	if (!*eformat)
	    format_double(v, buf, *n, *dp);
	else
	    scient_format(v, buf, *n, *dp);

	if (strlen(buf) <= *n)
	    break;

	if (*dp) {
	    *dp -= 1;
	}
	else {
	    if ((e_option) && (!*eformat)) {
		*eformat = 1;
		*dp = scient_dp;
	    }
	    else
		*n = strlen(buf);
	}
    }

    return 0;
}

int scient_format(double v, char *buf, int n, int dp)
{
    char temp[50];
    int i;

    sprintf(temp, "%#.*g", dp, v);
    for (i = 0; i <= n && temp[i] == ' '; i++) {
    }
    strcpy(buf, temp + i);

    return 0;
}

int format_double(double v, char *buf, int n, int dp)
{
    char fmt[15];
    char temp[100];
    int i, ncommas;

    sprintf(fmt, "%%%d.%df", n, dp);
    sprintf(temp, fmt, v);
    strcpy(buf, temp);
    G_insert_commas(temp);
    ncommas = strlen(temp) - strlen(buf);
    for (i = 0; i < ncommas && temp[i] == ' '; i++) {
    }
    strcpy(buf, temp + i);

    return 0;
}