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Plan 9 - man page for atof (plan9 section 2)

ATOF(2) 			       System Calls Manual				  ATOF(2)

       atof, atoi, atol, charstod, strtod, strtol, strtoul - convert text to numbers

       #include <u.h>
       #include <libc.h>

       double atof(char *nptr)

       int    atoi(char *nptr)

       long   atol(char *nptr)

       double charstod(int (*f)(void *), void *a)

       double strtod(char *nptr, char **rptr)

       long   strtol(char *nptr, char **rptr, int base)

       ulong  strtoul(char *nptr, char **rptr, int base)

       /* Alef only */

       int    strtoi(byte *nptr, byte **rptr, int base)

       uint   strtoui(byte *nptr, byte **rptr, int base)

       float  strtof(byte *nptr, byte **rptr);

       Atof,  atoi,  and  atol convert a string pointed to by nptr to floating, integer, and long
       integer representation respectively.  The first unrecognized character  ends  the  string.
       Leading C escapes are understood, as in strtol with base zero.

       Atof  recognizes  an  optional  string  of  tabs and spaces, then an optional sign, then a
       string of digits optionally containing a decimal point, then an optional or followed by an
       optionally signed integer.

       Atoi and atol recognize an optional string of tabs and spaces, then an optional sign, then
       a string of decimal digits.

       Strtod, strtol, and strtoul behave similarly to atof and atol and, if rptr  is  not  zero,
       set *rptr to point to the input character immediately after the string converted.

       Strtol  and  strtoul  interpret the digit string in the specified base, from 2 to 36, each
       digit being less than the base.	Digits with value over 9 are represented by letters,  a-z
       or  A-Z.  If base is 0, the input is interpreted as an integral constant in the style of C
       (with no suffixed type indicators): numbers are octal if they begin  with  hexadecimal  if
       they begin with or otherwise decimal.  Strtoul does not recognize signs.

       Charstod interprets floating point numbers like atof, but it gets successive characters by
       calling (*f)(a).  The last call to f terminates the scan, so it must have returned a char-
       acter  that  is	not  a legal continuation of a number.	Therefore, it may be necessary to
       back up the input stream one character after calling charstod.

       The routines strtol and strtoul are renamed strtoi and strtoui and  return  type  int  and
       uint.   There  is  no  charstod or atof.  Instead, strtof is like a floating-point base 10



       Zero is returned if the beginning of the input string is not interpretable  as  a  number;
       even in this case, rptr will be updated.
       These routines set errstr.

       Atoi and atol accept octal and hexadecimal numbers in the style of C, contrary to the ANSI


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