| |
| /* |
| * Name: getFloat |
| * Input: FILE ptr |
| * Output: float value |
| * Return: GET_FLOAT_SUCCESS, or |
| * GET_FLOAT_EOL, |
| * GET_FLOAT_EOF, |
| * GET_FLOAT_GET_STRING_FAILURE |
| * Description: The routine reads a space delimited float from the |
| * current position of the FILE pointer. The routine uses |
| * getString() to obtain the character string representation |
| * of the float and then uses the system level strtod() to |
| * find the float value. Note that the getString() routine |
| * does not allow the read to cross an end-of-line indicator |
| * as opposed to the system routines which do. In the event |
| * of an error, the output value is set to an implausible |
| * amount, MINIMUM_VALUE_OF_FLOAT to indicate an error occurred |
| * along with an appropriate return code. |
| * Calls: |
| * System: strtod() |
| * strlen() |
| * Author: M.L.Rivas |
| * |
| * Revision History: |
| * |
| * Date Name Revision |
| * ------- --------------- ------------------------------ |
| * 24May99 Matthew Rivas Created |
| * |
| * Copyright 1999, Atlantic Aerospace Electronics Corp. |
| */ |
| |
| #include <assert.h> /* for assert() */ |
| #include <errno.h> /* for extern errno definition */ |
| #include <stdlib.h> /* for NULL definition */ |
| #include <stdio.h> /* for FILE definition */ |
| #include <string.h> /* for strlen() definition */ |
| #include "dataManagement.h" /* for primitive type definitions */ |
| #include "getFloat.h" /* for getFloat() return codes */ |
| |
| extern int errno; |
| |
| /* |
| * Function prototype |
| */ |
| extern Char *getString( FILE *file ); |
| |
| Int getFloat( FILE *file, /* FILE stream to read */ |
| Float *value ) /* value to output */ |
| { /* begin getFloat() */ |
| Char *temp; /* temporary string used returned by getString() */ |
| Char *endptr; /* residual string after conversion from string to Float */ |
| Int returnCode; /* return code for this routine */ |
| |
| assert( file ); |
| assert( value ); |
| |
| /* |
| * Use utility routine getString to read the string representation of the |
| * Float. Check return code of getString for success or errors. On |
| * successful read of string, use system routine strtod to convert string |
| * to float value. Check for errors returned from system call and range |
| * errors. |
| */ |
| temp = getString( file ); |
| if ( temp != NULL ) { |
| /* |
| * A valid string was read from the input and is stored in temp |
| */ |
| *value = strtod( temp, &endptr ); |
| if ( *value == 0.0 && strlen( endptr ) > 0 && errno == ERANGE ) { |
| *value = MINIMUM_VALUE_OF_FLOAT; |
| returnCode = GET_FLOAT_BAD_CONVERSION; |
| } /* end of strtod error check */ |
| else { |
| if ( *value < MINIMUM_VALUE_OF_FLOAT ) { |
| *value = MINIMUM_VALUE_OF_FLOAT; |
| returnCode = GET_FLOAT_RANGE_EXCEEDED; |
| } /* end of value < MINIMUM_VALUE_OF_FLOAT */ |
| else if ( *value > MAXIMUM_VALUE_OF_FLOAT ) { |
| *value = MAXIMUM_VALUE_OF_FLOAT; |
| returnCode = GET_FLOAT_RANGE_EXCEEDED; |
| } /* end of value > MAXIMUM_VALUE_OF_FLOAT */ |
| else { |
| returnCode = GET_FLOAT_SUCCESS; |
| } /* end of else - SUCCESS */ |
| } /* end of else strtod did not error */ |
| } /* end if temp != NULL */ |
| else { |
| *value = MINIMUM_VALUE_OF_FLOAT; |
| returnCode = GET_FLOAT_EOI; |
| } /* end if GET_STRING low-level I/O error */ |
| |
| return ( returnCode ); |
| } /* end of getFloat() */ |
| |
