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Diffstat (limited to 'contrib/awk/POSIX.STD')
| -rw-r--r-- | contrib/awk/POSIX.STD | 119 |
1 files changed, 0 insertions, 119 deletions
diff --git a/contrib/awk/POSIX.STD b/contrib/awk/POSIX.STD deleted file mode 100644 index 04d31fc..0000000 --- a/contrib/awk/POSIX.STD +++ /dev/null @@ -1,119 +0,0 @@ -March 2001: - -It looks like the revised 1003.2 standard will actually follow the -rules given below. Hallelujah! - -October 1998: - -The 1003.2 work has been at a stand-still for ages. Who knows if or -when a new revision will actually happen... - -August 1995: - -Although the published 1003.2 standard contained the incorrect -comparison rules of 11.2 draft as described below, no actual implementation -of awk (that I know of) actually used those rules. - -A revision of the 1003.2 standard is in progress, and in the May 1995 -draft, the rules were fixed (based on my submissions for interpretation -requests) to match the description given below. Thus, the next version -of the standard will have a correct description of the comparison -rules. - -June 1992: - -Right now, the numeric vs. string comparisons are screwed up in draft -11.2. What prompted me to check it out was the note in gnu.bug.utils -which observed that gawk was doing the comparison $1 == "000" -numerically. I think that we can agree that intuitively, this should -be done as a string comparison. Version 2.13.2 of gawk follows the -current POSIX draft. Following is how I (now) think this -stuff should be done. - -1. A numeric literal or the result of a numeric operation has the NUMERIC - attribute. - -2. A string literal or the result of a string operation has the STRING - attribute. - -3. Fields, getline input, FILENAME, ARGV elements, ENVIRON elements and the - elements of an array created by split() that are numeric strings - have the STRNUM attribute. Otherwise, they have the STRING attribute. - Uninitialized variables also have the STRNUM attribute. - -4. Attributes propagate across assignments, but are not changed by - any use. (Although a use may cause the entity to acquire an additional - value such that it has both a numeric and string value -- this leaves the - attribute unchanged.) - -When two operands are compared, either string comparison or numeric comparison -may be used, depending on the attributes of the operands, according to the -following (symmetric) matrix: - - +---------------------------------------------- - | STRING NUMERIC STRNUM ---------+---------------------------------------------- - | -STRING | string string string - | -NUMERIC | string numeric numeric - | -STRNUM | string numeric numeric ---------+---------------------------------------------- - -So, the following program should print all OKs. - -echo '0e2 0a 0 0b -0e2 0a 0 0b' | -$AWK ' -NR == 1 { - num = 0 - str = "0e2" - - print ++test ": " ( (str == "0e2") ? "OK" : "OOPS" ) - print ++test ": " ( ("0e2" != 0) ? "OK" : "OOPS" ) - print ++test ": " ( ("0" != $2) ? "OK" : "OOPS" ) - print ++test ": " ( ("0e2" == $1) ? "OK" : "OOPS" ) - - print ++test ": " ( (0 == "0") ? "OK" : "OOPS" ) - print ++test ": " ( (0 == num) ? "OK" : "OOPS" ) - print ++test ": " ( (0 != $2) ? "OK" : "OOPS" ) - print ++test ": " ( (0 == $1) ? "OK" : "OOPS" ) - - print ++test ": " ( ($1 != "0") ? "OK" : "OOPS" ) - print ++test ": " ( ($1 == num) ? "OK" : "OOPS" ) - print ++test ": " ( ($2 != 0) ? "OK" : "OOPS" ) - print ++test ": " ( ($2 != $1) ? "OK" : "OOPS" ) - print ++test ": " ( ($3 == 0) ? "OK" : "OOPS" ) - print ++test ": " ( ($3 == $1) ? "OK" : "OOPS" ) - print ++test ": " ( ($2 != $4) ? "OK" : "OOPS" ) # 15 -} -{ - a = "+2" - b = 2 - if (NR % 2) - c = a + b - print ++test ": " ( (a != b) ? "OK" : "OOPS" ) # 16 and 22 - - d = "2a" - b = 2 - if (NR % 2) - c = d + b - print ++test ": " ( (d != b) ? "OK" : "OOPS" ) - - print ++test ": " ( (d + 0 == b) ? "OK" : "OOPS" ) - - e = "2" - print ++test ": " ( (e == b "") ? "OK" : "OOPS" ) - - a = "2.13" - print ++test ": " ( (a == 2.13) ? "OK" : "OOPS" ) - - a = "2.130000" - print ++test ": " ( (a != 2.13) ? "OK" : "OOPS" ) - - if (NR == 2) { - CONVFMT = "%.6f" - print ++test ": " ( (a == 2.13) ? "OK" : "OOPS" ) - } -}' |
