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[gawk-diffs] [SCM] gawk branch, gawk-4.0-stable, updated. 4fe1f4ac1aa0e4
|
From: |
Arnold Robbins |
|
Subject: |
[gawk-diffs] [SCM] gawk branch, gawk-4.0-stable, updated. 4fe1f4ac1aa0e4b99c9abb26794fc0d10ebb77c6 |
|
Date: |
Fri, 13 Jul 2012 09:11:38 +0000 |
This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "gawk".
The branch, gawk-4.0-stable has been updated
via 4fe1f4ac1aa0e4b99c9abb26794fc0d10ebb77c6 (commit)
from c494c33d585d0b7498b8e368434f60f2c107497f (commit)
Those revisions listed above that are new to this repository have
not appeared on any other notification email; so we list those
revisions in full, below.
- Log -----------------------------------------------------------------
http://git.sv.gnu.org/cgit/gawk.git/commit/?id=4fe1f4ac1aa0e4b99c9abb26794fc0d10ebb77c6
commit 4fe1f4ac1aa0e4b99c9abb26794fc0d10ebb77c6
Author: Arnold D. Robbins <address@hidden>
Date: Fri Jul 13 12:11:04 2012 +0300
Doc update and new test on getline with side effects.
diff --git a/doc/ChangeLog b/doc/ChangeLog
index 56ec4ef..e56c35a 100644
--- a/doc/ChangeLog
+++ b/doc/ChangeLog
@@ -1,3 +1,8 @@
+2012-07-13 Arnold D. Robbins <address@hidden>
+
+ * gawk.texi (Getline Notes): Discuss side effects in
+ argument expression.
+
2012-06-29 Arnold D. Robbins <address@hidden>
* gawk.texi, awkcard.in: Latest mawk understands /dev/stdin.
diff --git a/doc/gawk.info b/doc/gawk.info
index 5b063d7..c278148 100644
--- a/doc/gawk.info
+++ b/doc/gawk.info
@@ -5200,6 +5200,26 @@ in mind:
cause `FILENAME' to be updated if they cause `awk' to start
reading a new input file.
+ * If the variable being assigned is an expression with side effects,
+ different versions of `awk' behave differently upon encountering
+ end-of-file. Some versions don't evaluate the expression; many
+ versions (including `gawk') do. Here is an example, due to Duncan
+ Moore:
+
+ BEGIN {
+ system("echo 1 > f")
+ while ((getline a[++c] < "f") > 0) { }
+ print c
+ }
+
+ Here, the side effect is the `++c'. Is `c' incremented if end of
+ file is encountered, before the element in `a' is assigned?
+
+ `gawk' treats `getline' like a function call, and evaluates the
+ expression `a[++c]' before attempting to read from `f'. Other
+ versions of `awk' only evaluate the expression once they know that
+ there is a string value to be assigned. Caveat Emptor.
+
File: gawk.info, Node: Getline Summary, Prev: Getline Notes, Up: Getline
@@ -27537,321 +27557,321 @@ Node: Getline/Variable/Pipe222455
Node: Getline/Coprocess223562
Node: Getline/Variable/Coprocess224805
Node: Getline Notes225519
-Node: Getline Summary227461
-Ref: table-getline-variants227804
-Node: Command line directories228660
-Node: Printing229285
-Node: Print230916
-Node: Print Examples232253
-Node: Output Separators235037
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-Ref: Close Files And Pipes-Footnote-2273169
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-Node: Values274451
-Node: Constants275127
-Node: Scalar Constants275807
-Ref: Scalar Constants-Footnote-1276666
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-Ref: table-assign-ops304833
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+Node: Using Internal File Ops891944
+Node: Future Extensions894321
+Node: Basic Concepts896825
+Node: Basic High Level897582
+Ref: Basic High Level-Footnote-1901617
+Node: Basic Data Typing901802
+Node: Floating Point Issues906327
+Node: String Conversion Precision907410
+Ref: String Conversion Precision-Footnote-1909110
+Node: Unexpected Results909219
+Node: POSIX Floating Point Problems911045
+Ref: POSIX Floating Point Problems-Footnote-1914750
+Node: Glossary914788
+Node: Copying939764
+Node: GNU Free Documentation License977321
+Node: Index1002458
End Tag Table
diff --git a/doc/gawk.texi b/doc/gawk.texi
index ba5ffa3..fb17b71 100644
--- a/doc/gawk.texi
+++ b/doc/gawk.texi
@@ -7171,6 +7171,34 @@ trying to accomplish.
It is worth noting that those variants which do not use redirection
can cause @code{FILENAME} to be updated if they cause
@command{awk} to start reading a new input file.
+
address@hidden
+If the variable being assigned is an expression with side effects,
+different versions of @command{awk} behave differently upon encountering
+end-of-file. Some versions don't evaluate the expression; many versions
+(including @command{gawk}) do. Here is an example, due to Duncan Moore:
+
address@hidden
+Date: Sun, 01 Apr 2012 11:49:33 +0100
+From: Duncan Moore <duncan.moore@@gmx.com>
address@hidden ignore
+
address@hidden
+BEGIN @{
+ system("echo 1 > f")
+ while ((getline a[++c] < "f") > 0) @{ @}
+ print c
address@hidden
address@hidden example
+
address@hidden
+Here, the side effect is the @samp{++c}. Is @code{c} incremented if
+end of file is encountered, before the element in @code{a} is assigned?
+
address@hidden treats @code{getline} like a function call, and evaluates
+the expression @samp{a[++c]} before attempting to read from @file{f}.
+Other versions of @command{awk} only evaluate the expression once they
+know that there is a string value to be assigned. Caveat Emptor.
@end itemize
@node Getline Summary
diff --git a/test/ChangeLog b/test/ChangeLog
index 272e7cf..bb26c18 100644
--- a/test/ChangeLog
+++ b/test/ChangeLog
@@ -1,3 +1,8 @@
+2012-07-13 Arnold D. Robbins <address@hidden>
+
+ * Makefile.am (getline5): New test.
+ * getline5.awk, getline5.ok: New files.
+
2012-06-19 Arnold D. Robbins <address@hidden>
* Makefile.am (charasbytes): New test.
diff --git a/test/Makefile.am b/test/Makefile.am
index 43cc8f9..967a20c 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -298,6 +298,8 @@ EXTRA_DIST = \
getline4.awk \
getline4.in \
getline4.ok \
+ getline5.awk \
+ getline5.ok \
getlnbuf.awk \
getlnbuf.in \
getlnbuf.ok \
@@ -804,7 +806,7 @@ BASIC_TESTS = \
fcall_exit fcall_exit2 fldchg fldchgnf fnamedat fnarray fnarray2 \
fnaryscl fnasgnm fnmisc fordel forref forsimp fsbs fsrs fsspcoln \
fstabplus funsemnl funsmnam funstack \
- getline getline2 getline3 getline4 getlnbuf getnr2tb getnr2tm \
+ getline getline2 getline3 getline4 getline5 getlnbuf getnr2tb getnr2tm \
gsubasgn gsubtest gsubtst2 gsubtst3 gsubtst4 gsubtst5 gsubtst6 \
gsubtst7 gsubtst8 \
hex hsprint \
diff --git a/test/Makefile.in b/test/Makefile.in
index 0e4cc75..be56770 100644
--- a/test/Makefile.in
+++ b/test/Makefile.in
@@ -503,6 +503,8 @@ EXTRA_DIST = \
getline4.awk \
getline4.in \
getline4.ok \
+ getline5.awk \
+ getline5.ok \
getlnbuf.awk \
getlnbuf.in \
getlnbuf.ok \
@@ -1009,7 +1011,7 @@ BASIC_TESTS = \
fcall_exit fcall_exit2 fldchg fldchgnf fnamedat fnarray fnarray2 \
fnaryscl fnasgnm fnmisc fordel forref forsimp fsbs fsrs fsspcoln \
fstabplus funsemnl funsmnam funstack \
- getline getline2 getline3 getline4 getlnbuf getnr2tb getnr2tm \
+ getline getline2 getline3 getline4 getline5 getlnbuf getnr2tb getnr2tm \
gsubasgn gsubtest gsubtst2 gsubtst3 gsubtst4 gsubtst5 gsubtst6 \
gsubtst7 gsubtst8 \
hex hsprint \
@@ -2168,6 +2170,11 @@ getline4:
@AWKPATH=$(srcdir) $(AWK) -f address@hidden < $(srcdir)/address@hidden
>_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
@-$(CMP) $(srcdir)/address@hidden _$@ && rm -f _$@
+getline5:
+ @echo getline5
+ @AWKPATH=$(srcdir) $(AWK) -f address@hidden >_$@ 2>&1 || echo EXIT
CODE: $$? >>_$@
+ @-$(CMP) $(srcdir)/address@hidden _$@ && rm -f _$@
+
getnr2tb:
@echo getnr2tb
@AWKPATH=$(srcdir) $(AWK) -f address@hidden < $(srcdir)/address@hidden
>_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
diff --git a/test/Maketests b/test/Maketests
index 34a0aaa..1b58d5b 100644
--- a/test/Maketests
+++ b/test/Maketests
@@ -320,6 +320,11 @@ getline4:
@AWKPATH=$(srcdir) $(AWK) -f address@hidden < $(srcdir)/address@hidden
>_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
@-$(CMP) $(srcdir)/address@hidden _$@ && rm -f _$@
+getline5:
+ @echo getline5
+ @AWKPATH=$(srcdir) $(AWK) -f address@hidden >_$@ 2>&1 || echo EXIT
CODE: $$? >>_$@
+ @-$(CMP) $(srcdir)/address@hidden _$@ && rm -f _$@
+
getnr2tb:
@echo getnr2tb
@AWKPATH=$(srcdir) $(AWK) -f address@hidden < $(srcdir)/address@hidden
>_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
diff --git a/test/getline5.awk b/test/getline5.awk
new file mode 100644
index 0000000..4757bcf
--- /dev/null
+++ b/test/getline5.awk
@@ -0,0 +1,35 @@
+# Message-ID: <address@hidden>
+# Date: Sun, 01 Apr 2012 11:49:33 +0100
+# From: Duncan Moore <address@hidden>
+# To: "address@hidden" <address@hidden>
+# Subject: [bug-gawk] getline difference from gawk versions >=4.0.0
+#
+# Hi
+#
+# b.awk:
+#
+# BEGIN {
+# system("echo 1 > f")
+# while ((getline a[++c] < "f") > 0) {}
+# print c
+# }
+#
+# gawk -f b.awk
+#
+# Prior to gawk 4.0.0 this outputs:
+#
+# 1
+#
+# For 4.0.0 and 4.0.1 it outputs:
+#
+# 2
+#
+# Regards
+# Duncan Moore
+
+BEGIN {
+ system("echo 1 > f")
+ while ((getline a[++c] < "f") > 0) {}
+ print c
+ system("rm -f f")
+}
diff --git a/test/getline5.ok b/test/getline5.ok
new file mode 100644
index 0000000..0cfbf08
--- /dev/null
+++ b/test/getline5.ok
@@ -0,0 +1 @@
+2
-----------------------------------------------------------------------
Summary of changes:
doc/ChangeLog | 5 +
doc/gawk.info | 652 +++++++++++++++++++-----------------
doc/gawk.texi | 28 ++
test/ChangeLog | 5 +
test/Makefile.am | 4 +-
test/Makefile.in | 9 +-
test/Maketests | 5 +
test/getline5.awk | 35 ++
test/{rsnulbig2.ok => getline5.ok} | 0
9 files changed, 425 insertions(+), 318 deletions(-)
create mode 100644 test/getline5.awk
copy test/{rsnulbig2.ok => getline5.ok} (100%)
hooks/post-receive
--
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- [gawk-diffs] [SCM] gawk branch, gawk-4.0-stable, updated. 4fe1f4ac1aa0e4b99c9abb26794fc0d10ebb77c6,
Arnold Robbins <=