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author | greg@kroah.com <greg@kroah.com> | 2003-10-22 18:37:40 -0700 |
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committer | Greg KH <gregkh@suse.de> | 2005-04-26 21:05:23 -0700 |
commit | a41a0e28c2ba0abf99b5e7ea17645ae0e4f05758 (patch) | |
tree | f800d7d565c294adb15f88d4f14064f93054da70 /klibc/klibc/strntoumax.c | |
parent | 6c0eae77a1443c51a0c089f4d4053ffff13666f5 (diff) | |
download | systemd-a41a0e28c2ba0abf99b5e7ea17645ae0e4f05758.tar.gz |
[PATCH] added klibc version 0.82 (cvs tree) to the udev tree.
Not hooked up to the build yet.
Diffstat (limited to 'klibc/klibc/strntoumax.c')
-rw-r--r-- | klibc/klibc/strntoumax.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/klibc/klibc/strntoumax.c b/klibc/klibc/strntoumax.c new file mode 100644 index 0000000000..4e30637d2c --- /dev/null +++ b/klibc/klibc/strntoumax.c @@ -0,0 +1,75 @@ +/* + * strntoumax.c + * + * The strntoumax() function and associated + */ + +#include <stddef.h> +#include <stdint.h> +#include <ctype.h> + +static inline int digitval(int ch) +{ + if ( ch >= '0' && ch <= '9' ) { + return ch-'0'; + } else if ( ch >= 'A' && ch <= 'Z' ) { + return ch-'A'+10; + } else if ( ch >= 'a' && ch <= 'z' ) { + return ch-'a'+10; + } else { + return -1; + } +} + +uintmax_t strntoumax(const char *nptr, char **endptr, int base, size_t n) +{ + int minus = 0; + uintmax_t v = 0; + int d; + + while ( n && isspace((unsigned char)*nptr) ) { + nptr++; + n--; + } + + /* Single optional + or - */ + if ( n && *nptr == '-' ) { + minus = 1; + nptr++; + n--; + } else if ( n && *nptr == '+' ) { + nptr++; + } + + if ( base == 0 ) { + if ( n >= 2 && nptr[0] == '0' && + (nptr[1] == 'x' || nptr[1] == 'X') ) { + n -= 2; + nptr += 2; + base = 16; + } else if ( n >= 1 && nptr[0] == '0' ) { + n--; + nptr++; + base = 8; + } else { + base = 10; + } + } else if ( base == 16 ) { + if ( n >= 2 && nptr[0] == '0' && + (nptr[1] == 'x' || nptr[1] == 'X') ) { + n -= 2; + nptr += 2; + } + } + + while ( n && (d = digitval(*nptr)) >= 0 && d < base ) { + v = v*base + d; + n--; + nptr++; + } + + if ( endptr ) + *endptr = (char *)nptr; + + return minus ? -v : v; +} |