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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]) # }
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