pSOSystem System Calls - Read

pREPC+ System Calls atof
atof Converts a string to a double.
#include
double atof(
const char *nptr /* string */
)
Description
Arguments
Return Value
Error Codes
Notes
This function converts the initial part of the string pointed to by nptr to a double
representation. Leading white spaces are ignored. The argument nptr can be in
scientific exponential form (for example, +123.45e+67, -123.45E+67). This function
stops parsing nptr when it detects a character inconsistent with a double data
type. If the first nonwhite space character is other than a sign, a digit or a decimal
point, a value of 0 is returned.
Except for the behavior on error, this call is equivalent to:
strtod(str, (char **)NULL);
nptr Points to the string to be converted.
This function returns the converted value. In the event of an error, errno is set to
indicate the condition.
Refer to Appendix B.
The pREPC+ library returns double values (including floating point) in the CPU
register pair designated by the compiler to receive a return value of type double
from a function call when a hardware floating point is not selected. Please refer to
your compiler manual for the register pair. Additionally, if the FPU bit is set in the
processor type entry of the Node Configuration Table, the pREPC+ library also
pSOSystem System Calls 3-9
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