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✎ CARVE FLESH

EDITING: strtonum.awk

# mystrtonum --- convert string to number

#
# Arnold Robbins, arnold@skeeve.com, Public Domain
# February, 2004
# Revised June, 2014

function mystrtonum(str,        ret, 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)
            # index() returns 0 if c not in string,
            # includes c == "0"
            k = index("1234567", c)

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)
            # index() returns 0 if c not in string,
            # includes c == "0"
            k = index("123456789abcdef", c)

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[8] = "1.32E2"
#
#     for (i = 1; i in a; i++)
#         print a[i], strtonum(a[i]), mystrtonum(a[i])
# }

CANCEL

Name	Type	Size	Modified	Actions
↩ ..	DIR	—	—
📄 assert.awk	AWK	383 B	2023-09-11 18:21	EDIT
📄 bits2str.awk	AWK	330 B	2023-09-11 18:21	EDIT
📄 cliff_rand.awk	AWK	307 B	2023-09-11 18:21	EDIT
📄 ctime.awk	AWK	234 B	2023-09-11 18:21	EDIT
📄 ftrans.awk	AWK	315 B	2023-09-11 18:21	EDIT
📄 getopt.awk	AWK	2.2 KB	2023-09-11 18:21	EDIT
📄 gettime.awk	AWK	2.4 KB	2023-09-11 18:21	EDIT
📄 group.awk	AWK	1.7 KB	2023-09-11 18:21	EDIT
📄 inplace.awk	AWK	573 B	2023-09-11 18:21	EDIT
📄 join.awk	AWK	378 B	2023-09-11 18:21	EDIT
📄 libintl.awk	AWK	238 B	2023-09-11 18:21	EDIT
📄 noassign.awk	AWK	422 B	2023-09-11 18:21	EDIT
📄 ord.awk	AWK	937 B	2023-09-11 18:21	EDIT
📄 passwd.awk	AWK	1.2 KB	2023-09-11 18:21	EDIT
📄 processarray.awk	AWK	355 B	2023-09-11 18:21	EDIT
📄 quicksort.awk	AWK	1 KB	2023-09-11 18:21	EDIT
📄 readable.awk	AWK	489 B	2023-09-11 18:21	EDIT
📄 readfile.awk	AWK	267 B	2023-09-11 18:21	EDIT
📄 rewind.awk	AWK	404 B	2023-09-11 18:21	EDIT
📄 round.awk	AWK	661 B	2023-09-11 18:21	EDIT
📄 shellquote.awk	AWK	472 B	2023-09-11 18:21	EDIT
📄 strtonum.awk	AWK	1.4 KB	2023-09-11 18:21	EDIT
📄 walkarray.awk	AWK	214 B	2023-09-11 18:21	EDIT
📄 zerofile.awk	AWK	424 B	2023-09-11 18:21	EDIT