diff options
Diffstat (limited to 'stdlib/stdlib.h')
| -rw-r--r-- | stdlib/stdlib.h | 109 |
1 files changed, 108 insertions, 1 deletions
diff --git a/stdlib/stdlib.h b/stdlib/stdlib.h index 2a3cf8ec5f..c6c504a143 100644 --- a/stdlib/stdlib.h +++ b/stdlib/stdlib.h @@ -198,7 +198,83 @@ extern __inline __ptr_t initstate (unsigned int __seed, extern __inline __ptr_t setstate (__ptr_t __statebuf) { return __setstate (__statebuf); } #endif /* Optimizing GCC >=2. */ -#endif /* Use BSD. */ + +#ifdef __USE_REENTRANT +/* Reentrant versions of the `random' family of functions. + These functions all use the following data structure to contain + state, rather than global state variables. */ + +struct random_data + { + long int *fptr; /* Front pointer. */ + long int *rptr; /* Rear pointer. */ + long int *state; /* Array of state values. */ + int rand_type; /* Type of random number generator. */ + int rand_deg; /* Degree of random number generator. */ + int rand_sep; /* Distance between front and rear. */ + long int *end_ptr; /* Pointer behind state table. */ + }; + +extern int __random_r __P ((struct random_data *__buf, long int *__result)); +extern int __srandom_r __P ((unsigned int __seed, struct random_data *__buf)); +extern int __initstate_r __P ((unsigned int __seed, __ptr_t __statebuf, + size_t __statelen, struct random_data *__buf)); +extern int __setstate_r __P ((__ptr_t __statebuf, struct random_data *__buf)); + +extern int random_r __P ((struct random_data *__buf, long int *__result)); +extern int srandom_r __P ((unsigned int __seed, struct random_data *__buf)); +extern int initstate_r __P ((unsigned int __seed, __ptr_t __statebuf, + size_t __statelen, struct random_data *__buf)); +extern int setstate_r __P ((__ptr_t __statebuf, struct random_data *__buf)); +#endif /* __USE_REENTRANT. */ +#endif /* Use BSD. */ + + +#ifdef __USE_SVID +/* System V style 48-bit random number generator functions. */ + +/* Data structure for communication with thread safe versions. */ +struct drand48_data + { + unsigned short int X[3]; /* Current state. */ + unsigned short int a[3]; /* Factor in congruential formula. */ + unsigned short int c; /* Additive const. in congruential formula. */ + unsigned short int old_X[3]; /* Old state. */ + int init; /* Flag for initializing. */ + }; + +/* Return non-negative, double-precision floating-point value in [0.0,1.0). */ +extern double drand48 __P ((void)); +extern int drand48_r __P ((struct drand48_data *__buffer, double *__result)); +extern double erand48 __P ((unsigned short int __xsubi[3])); +extern int erand48_r __P ((unsigned short int __xsubi[3], + struct drand48_data *__buffer, double *__result)); +/* Return non-negative, long integer in [0,2^31). */ +extern long lrand48 __P ((void)); +extern int lrand48_r __P ((struct drand48_data *__buffer, long *__result)); +extern long nrand48 __P ((unsigned short int __xsubi[3])); +extern int nrand48_r __P ((unsigned short int __xsubi[3], + struct drand48_data *__buffer, long *__result)); +/* Return signed, long integers in [-2^31,2^31). */ +extern long mrand48 __P ((void)); +extern int mrand48_r __P ((struct drand48_data *__buffer, long *__result)); +extern long jrand48 __P ((unsigned short int __xsubi[3])); +extern int jrand48_r __P ((unsigned short int __xsubi[3], + struct drand48_data *__buffer, long *__result)); +/* Seed random number generator. */ +extern void srand48 __P ((long __seedval)); +extern int srand48_r __P ((long __seedval, struct drand48_data *__buffer)); +extern unsigned short int *seed48 __P ((unsigned short int __seed16v[3])); +extern int seed48_r __P ((unsigned short int __seed16v[3], + struct drand48_data *__buffer)); +extern void lcong48 __P ((unsigned short int __param[7])); +extern int lcong48_r __P ((unsigned short int __param[7], + struct drand48_data *__buffer)); + +/* Internal function to compute next state of the generator. */ +extern int __drand48_iterate __P ((unsigned short int __xsubi[3], + struct drand48_data *__buffer)); +#endif /* __USE_SVID. */ /* Allocate SIZE bytes of memory. */ @@ -268,7 +344,10 @@ extern int system __P ((__const char *__command)); /* Shorthand for type of comparison functions. */ +#ifndef __COMPAR_FN_T +#define __COMPAR_FN_T typedef int (*__compar_fn_t) __P ((__const __ptr_t, __const __ptr_t)); +#endif #ifdef __USE_GNU typedef __compar_fn_t comparison_fn_t; @@ -308,6 +387,34 @@ extern __CONSTVALUE div_t div __P ((int __numer, int __denom)); extern __CONSTVALUE ldiv_t ldiv __P ((long int __numer, long int __denom)); +#ifdef __USE_SVID +/* Convert floating point numbers to strings. The returned values are + valid only until another call to the same function. */ + +/* Convert VALUE to a string with NDIGIT digits and return a pointer to + this. Set *DECPT with the position of the decimal character and *SIGN + with the sign of the number. */ +char *ecvt __P ((double __value, int __ndigit, int *__decpt, int *sign)); + +/* Convert VALUE to a string rounded to NDIGIT decimal digits. Set *DECPT + with the position of the decimal character and *SIGN with the sign of + the number. */ +char *fcvt __P ((double __value, int __ndigit, int *__decpt, int *sign)); + +/* If possible convert VALUE to a string with NDIGIT significant digits. + Otherwise use exponential representation. The resulting string will + be written to BUF. */ +char *gcvt __P ((double __value, int __ndigit, char *__buf)); + +/* Reentrant version of the functions above which provide their own + buffers. */ +int ecvt_r __P ((double __value, int __ndigit, int *__decpt, int *sign, + char *__buf, int *__len)); +int fcvt_r __P ((double __value, int __ndigit, int *__decpt, int *sign, + char *__buf, int *__len)); +#endif + + /* Return the length of the multibyte character in S, which is no longer than N. */ extern int mblen __P ((__const char *__s, size_t __n)); |