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    Contents of /trunk/mkinitrd-magellan/klibc/usr/klibc/strntoumax.c

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    Revision 532 - (show annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
    File MIME type: text/plain
    File size: 1231 byte(s) 
    -import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
    1 /*
    2 * strntoumax.c
    3 *
    4 * The strntoumax() function and associated
    5 */
    6
    7 #include <stddef.h>
    8 #include <stdint.h>
    9 #include <ctype.h>
    10
    11 static inline int digitval(int ch)
    12 {
    13 if (ch >= '0' && ch <= '9') {
    14 return ch - '0';
    15 } else if (ch >= 'A' && ch <= 'Z') {
    16 return ch - 'A' + 10;
    17 } else if (ch >= 'a' && ch <= 'z') {
    18 return ch - 'a' + 10;
    19 } else {
    20 return -1;
    21 }
    22 }
    23
    24 uintmax_t strntoumax(const char *nptr, char **endptr, int base, size_t n)
    25 {
    26 int minus = 0;
    27 uintmax_t v = 0;
    28 int d;
    29
    30 while (n && isspace((unsigned char)*nptr)) {
    31 nptr++;
    32 n--;
    33 }
    34
    35 /* Single optional + or - */
    36 if (n) {
    37 char c = *nptr;
    38 if (c == '-' || c == '+') {
    39 minus = (c == '-');
    40 nptr++;
    41 n--;
    42 }
    43 }
    44
    45 if (base == 0) {
    46 if (n >= 2 && nptr[0] == '0' &&
    47 (nptr[1] == 'x' || nptr[1] == 'X')) {
    48 n -= 2;
    49 nptr += 2;
    50 base = 16;
    51 } else if (n >= 1 && nptr[0] == '0') {
    52 n--;
    53 nptr++;
    54 base = 8;
    55 } else {
    56 base = 10;
    57 }
    58 } else if (base == 16) {
    59 if (n >= 2 && nptr[0] == '0' &&
    60 (nptr[1] == 'x' || nptr[1] == 'X')) {
    61 n -= 2;
    62 nptr += 2;
    63 }
    64 }
    65
    66 while (n && (d = digitval(*nptr)) >= 0 && d < base) {
    67 v = v * base + d;
    68 n--;
    69 nptr++;
    70 }
    71
    72 if (endptr)
    73 *endptr = (char *)nptr;
    74
    75 return minus ? -v : v;
    76 }