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- # strtonum --- 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]*$/) {
- # octal
- n = length(str)
- ret = 0
- for (i = 1; i <= n; i++) {
- c = substr(str, i, 1)
- if ((k = index("01234567", c)) > 0)
- k-- # adjust for 1-basing in awk
-
- ret = ret * 8 + k
- }
- } else if (str ~ /^0[xX][0-9a-fA-f]+/) {
- # hexadecimal
- str = substr(str, 3) # lop off leading 0x
- n = length(str)
- ret = 0
- for (i = 1; i <= n; i++) {
- c = substr(str, i, 1)
- c = tolower(c)
- if ((k = index("0123456789", c)) > 0)
- k-- # adjust for 1-basing in awk
- else if ((k = index("abcdef", c)) > 0)
- k += 9
-
- ret = ret * 16 + k
- }
- } else if (str ~ /^[-+]?([0-9]+([.][0-9]*([Ee][0-9]+)?)?|([.][0-9]+([Ee][-+]?[0-9]+)?))$/) {
- # 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])
- # }
-