diff options
Diffstat (limited to 'libc-top-half/musl/src/internal/intscan.c')
-rw-r--r-- | libc-top-half/musl/src/internal/intscan.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/internal/intscan.c b/libc-top-half/musl/src/internal/intscan.c new file mode 100644 index 0000000..a4a5ae8 --- /dev/null +++ b/libc-top-half/musl/src/internal/intscan.c @@ -0,0 +1,100 @@ +#include <limits.h> +#include <errno.h> +#include <ctype.h> +#include "shgetc.h" + +/* Lookup table for digit values. -1==255>=36 -> invalid */ +static const unsigned char table[] = { -1, +-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, +-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, +-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,-1,-1,-1,-1,-1,-1, +-1,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24, +25,26,27,28,29,30,31,32,33,34,35,-1,-1,-1,-1,-1, +-1,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24, +25,26,27,28,29,30,31,32,33,34,35,-1,-1,-1,-1,-1, +-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, +-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, +-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, +-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, +-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, +-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, +-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, +-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, +}; + +unsigned long long __intscan(FILE *f, unsigned base, int pok, unsigned long long lim) +{ + const unsigned char *val = table+1; + int c, neg=0; + unsigned x; + unsigned long long y; + if (base > 36 || base == 1) { + errno = EINVAL; + return 0; + } + while (isspace((c=shgetc(f)))); + if (c=='+' || c=='-') { + neg = -(c=='-'); + c = shgetc(f); + } + if ((base == 0 || base == 16) && c=='0') { + c = shgetc(f); + if ((c|32)=='x') { + c = shgetc(f); + if (val[c]>=16) { + shunget(f); + if (pok) shunget(f); + else shlim(f, 0); + return 0; + } + base = 16; + } else if (base == 0) { + base = 8; + } + } else { + if (base == 0) base = 10; + if (val[c] >= base) { + shunget(f); + shlim(f, 0); + errno = EINVAL; + return 0; + } + } + if (base == 10) { + for (x=0; c-'0'<10U && x<=UINT_MAX/10-1; c=shgetc(f)) + x = x*10 + (c-'0'); + for (y=x; c-'0'<10U && y<=ULLONG_MAX/10 && 10*y<=ULLONG_MAX-(c-'0'); c=shgetc(f)) + y = y*10 + (c-'0'); + if (c-'0'>=10U) goto done; + } else if (!(base & base-1)) { + int bs = "\0\1\2\4\7\3\6\5"[(0x17*base)>>5&7]; + for (x=0; val[c]<base && x<=UINT_MAX/32; c=shgetc(f)) + x = x<<bs | val[c]; + for (y=x; val[c]<base && y<=ULLONG_MAX>>bs; c=shgetc(f)) + y = y<<bs | val[c]; + } else { + for (x=0; val[c]<base && x<=UINT_MAX/36-1; c=shgetc(f)) + x = x*base + val[c]; + for (y=x; val[c]<base && y<=ULLONG_MAX/base && base*y<=ULLONG_MAX-val[c]; c=shgetc(f)) + y = y*base + val[c]; + } + if (val[c]<base) { + for (; val[c]<base; c=shgetc(f)); + errno = ERANGE; + y = lim; + if (lim&1) neg = 0; + } +done: + shunget(f); + if (y>=lim) { + if (!(lim&1) && !neg) { + errno = ERANGE; + return lim-1; + } else if (y>lim) { + errno = ERANGE; + return lim; + } + } + return (y^neg)-neg; +} |