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compat.awk
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1990-02-08
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# compat - check if awk program uses new built-in names
# AKW p80
BEGIN { asplit("close system atan2 sin cos rand srand " \
"match sub gsub", fcns)
asplit("ARGC ARGV FNR RSTART RLENGTH SUBSEP", vars)
asplit("do delete function return", keys)
}
{ line = $0 }
/"/ { gsub(/"([^"]|\\")*"/, "", line) } # remove strings,
/\// { gsub(/\/([^\/]|\\\/)+\//, "", line) } # reg exprs,
/#/ { sub(/#.*/, "", line) } # and comments
{ n = split(line, x, "[^A-Za-z0-9_]+") # into words
for (i = 1; i <= n; i++) {
if (x[i] in fcns)
warn(x[i] " is now a built-in function")
if (x[i] in vars)
warn(x[i] " is now a built-in variable")
if (x[i] in keys)
warn(x[i] " is now a keyword")
}
}
function asplit(str, arr) { # make an assoc array from str
n = split(str, temp)
for (i = 1; i <= n; i++)
arr[temp[i]]++
return n
}
function warn(s) {
sub(/^[ \t]*/, "")
printf("file %s, line %d: %s\n\t%s\n", FILENAME, FNR, s, $0)
}