/* Copyright (C) 2003 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include #include /* Needed for MY_ERRNO_ERANGE */ #include #undef ULONGLONG_MAX /* Needed under MetroWerks Compiler, since MetroWerks compiler does not properly handle a constant expression containing a mod operator */ #if defined(__NETWARE__) && defined(__MWERKS__) static ulonglong ulonglong_max= ~(ulonglong) 0; #define ULONGLONG_MAX ulonglong_max #else #define ULONGLONG_MAX (~(ulonglong) 0) #endif /* __NETWARE__ && __MWERKS__ */ #define MAX_NEGATIVE_NUMBER ((ulonglong) LL(0x8000000000000000)) #define INIT_CNT 9 #define LFACTOR ULL(1000000000) #define LFACTOR1 ULL(10000000000) #define LFACTOR2 ULL(100000000000) static unsigned long lfactor[9]= { 1L, 10L, 100L, 1000L, 10000L, 100000L, 1000000L, 10000000L, 100000000L }; /* Convert a string to an to unsigned long long integer value SYNOPSYS my_strtoll10() nptr in pointer to the string to be converted endptr in/out pointer to the end of the string/ pointer to the stop character error out returned error code DESCRIPTION This function takes the decimal representation of integer number from string nptr and converts it to an signed or unsigned long long integer value. Space characters and tab are ignored. A sign character might precede the digit characters. The number may have any number of pre-zero digits. The function stops reading the string nptr at the first character that is not a decimal digit. If endptr is not NULL then the function will not read characters after *endptr. RETURN VALUES Value of string as a signed/unsigned longlong integer if no error and endptr != NULL, it will be set to point at the character after the number The error parameter contains information how things went: -1 Number was an ok negative number 0 ok ERANGE If the the value of the converted number exceeded the maximum negative/unsigned long long integer. In this case the return value is ~0 if value was positive and LONGLONG_MIN if value was negative. EDOM If the string didn't contain any digits. In this case the return value is 0. If endptr is not NULL the function will store the end pointer to the stop character here. */ longlong my_strtoll10(const char *nptr, char **endptr, int *error) { const char *s, *end, *start, *n_end, *true_end; char *dummy; unsigned char c; unsigned long i, j, k; ulonglong li; int negative; ulong cutoff, cutoff2, cutoff3; s= nptr; /* If fixed length string */ if (endptr) { end= *endptr; while (s != end && (*s == ' ' || *s == '\t')) s++; if (s == end) goto no_conv; } else { endptr= &dummy; /* Easier end test */ while (*s == ' ' || *s == '\t') s++; if (!*s) goto no_conv; /* This number must be big to guard against a lot of pre-zeros */ end= s+65535; /* Can't be longer than this */ } /* Check for a sign. */ negative= 0; if (*s == '-') { *error= -1; /* Mark as negative number */ negative= 1; if (++s == end) goto no_conv; cutoff= MAX_NEGATIVE_NUMBER / LFACTOR2; cutoff2= (MAX_NEGATIVE_NUMBER % LFACTOR2) / 100; cutoff3= MAX_NEGATIVE_NUMBER % 100; } else { *error= 0; if (*s == '+') { if (++s == end) goto no_conv; } cutoff= ULONGLONG_MAX / LFACTOR2; cutoff2= ULONGLONG_MAX % LFACTOR2 / 100; cutoff3= ULONGLONG_MAX % 100; } /* Handle case where we have a lot of pre-zero */ if (*s == '0') { i= 0; do { if (++s == end) goto end_i; /* Return 0 */ } while (*s == '0'); n_end= s+ INIT_CNT; } else { /* Read first digit to check that it's a valid number */ if ((c= (*s-'0')) > 9) goto no_conv; i= c; n_end= ++s+ INIT_CNT-1; } /* Handle first 9 digits and store them in i */ if (n_end > end) n_end= end; for (; s != n_end ; s++) { if ((c= (*s-'0')) > 9) goto end_i; i= i*10+c; } if (s == end) goto end_i; /* Handle next 9 digits and store them in j */ j= 0; start= s; /* Used to know how much to shift i */ n_end= true_end= s + INIT_CNT; if (n_end > end) n_end= end; do { if ((c= (*s-'0')) > 9) goto end_i_and_j; j= j*10+c; } while (++s != n_end); if (s == end) { if (s != true_end) goto end_i_and_j; goto end3; } if ((c= (*s-'0')) > 9) goto end3; /* Handle the next 1 or 2 digits and store them in k */ k=c; if (++s == end || (c= (*s-'0')) > 9) goto end4; k= k*10+c; *endptr= (char*) ++s; /* number string should have ended here */ if (s != end && (c= (*s-'0')) <= 9) goto overflow; /* Check that we didn't get an overflow with the last digit */ if (i > cutoff || (i == cutoff && ((j > cutoff2 || j == cutoff2) && k > cutoff3))) goto overflow; li=i*LFACTOR2+ (ulonglong) j*100 + k; return (longlong) li; overflow: /* *endptr is set here */ *error= MY_ERRNO_ERANGE; return negative ? LONGLONG_MIN : (longlong) ULONGLONG_MAX; end_i: *endptr= (char*) s; return (negative ? ((longlong) -(long) i) : (longlong) i); end_i_and_j: li= (ulonglong) i * lfactor[(uint) (s-start)] + j; *endptr= (char*) s; return (negative ? -((longlong) li) : (longlong) li); end3: li=(ulonglong) i*LFACTOR+ (ulonglong) j; *endptr= (char*) s; return (negative ? -((longlong) li) : (longlong) li); end4: li=(ulonglong) i*LFACTOR1+ (ulonglong) j * 10 + k; *endptr= (char*) s; if (negative) { if (li > MAX_NEGATIVE_NUMBER) goto overflow; return -((longlong) li); } return (longlong) li; no_conv: /* There was no number to convert. */ *error= MY_ERRNO_EDOM; *endptr= (char *) nptr; return 0; }