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# mystrtonum --- convert string to number
#
# Arnold Robbins, arnold@skeeve.com, Public Domain
# February, 2004
function mystrtonum(str, ret, chars, n, i, k, c)
{
if (str ~ /^0[0-7]*$/) {
# octal
n = length(str)
ret = 0
for (i = 1; i <= n; i++) {
c = substr(str, i, 1)
if ((k = index("01234567", c)) > 0)
k-- # adjust for 1-basing in awk
ret = ret * 8 + k
}
} else if (str ~ /^0[xX][[:xdigit:]]+/) {
# hexadecimal
str = substr(str, 3) # lop off leading 0x
n = length(str)
ret = 0
for (i = 1; i <= n; i++) {
c = substr(str, i, 1)
c = tolower(c)
if ((k = index("0123456789", c)) > 0)
k-- # adjust for 1-basing in awk
else if ((k = index("abcdef", c)) > 0)
k += 9
ret = ret * 16 + k
}
} else if (str ~ \
/^[-+]?([0-9]+([.][0-9]*([Ee][0-9]+)?)?|([.][0-9]+([Ee][-+]?[0-9]+)?))$/) {
# decimal number, possibly floating point
ret = str + 0
} else
ret = "NOT-A-NUMBER"
return ret
}
# BEGIN { # gawk test harness
# a[1] = "25"
# a[2] = ".31"
# a[3] = "0123"
# a[4] = "0xdeadBEEF"
# a[5] = "123.45"
# a[6] = "1.e3"
# a[7] = "1.32"
# a[7] = "1.32E2"
#
# for (i = 1; i in a; i++)
# print a[i], strtonum(a[i]), mystrtonum(a[i])
# }