View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0000832 | 1003.1(2013)/Issue7+TC1 | Shell and Utilities | public | 2014-04-06 08:15 | 2019-06-10 08:54 |
| Reporter | ormaaj | Assigned To | ajosey | ||
| Priority | normal | Severity | Objection | Type | Clarification Requested |
| Status | Closed | Resolution | Accepted As Marked | ||
| Name | Dan Douglas | ||||
| Organization | |||||
| User Reference | |||||
| Section | 2.6.5 | ||||
| Page Number | 2333 | ||||
| Line Number | 74133 | ||||
| Interp Status | Approved | ||||
| Final Accepted Text | See 0000832:0002220. | ||||
| Summary | 0000832: Clarify whether field splitting applies to arithmetic expansion | ||||
| Description | The first paragraph of section 2.6.5 states that after parameter expansion, command substitution, and arithmetic expansion, field splitting should apply to unquoted expansions and substitutions. That sentence could be interpreted as either referring to arithmetic expansion only with regards to the order of operations, or to imply that field splitting should apply to the results. The subsequent sentence beginning on line 74136 then refers only to parameter expansion and command substitution without being explicit about whether that should exclude arithmetic expansion. Many but not all current implementations do appear to apply field splitting to the results of arithmetic expansion per the following testcase: #!/bin/sh code='${ZSH_VERSION+false} || emulate sh ${BASH_VERSION+set -o posix} IFS=0 printf "<%s> " $((1230456))' for sh in bash zsh ksh mksh posh dash bb; do printf '%-7s %s\n' "${sh}:" "$("$sh" -c "$code")" done Which produces: bash: <123> <456> zsh: <1230456> ksh: <123> <456> # AT&T ksh mksh: <1230456> posh: <1230456> dash: <123> <456> bb: <123> <456> # Busybox ash | ||||
| Desired Action | Improve the wording so that either: a) Field splitting is either explicitly required or explicitly disallowed on arithmetic expansion. b) Field splitting is explicitly unspecified for arithmetic expansion. | ||||
| Tags | tc2-2008 | ||||
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Interpretation response ------------------------ The standard is unclear on this issue, and no conformance distinction can be made between alternative implementations based on this. This is being referred to the sponsor. Rationale: ------------- Section 2.6.5 doesn't mention arithmetic expansion (which specifies when field splitting is done), but section 2.6 (where is talks about the order of word expansions) does require field splitting after arithmetic expansions. Notes to the Editor (not part of this interpretation): ------------------------------------------------------- Change: The shell shall treat each character of the IFS as a delimiter and use the delimiters as field terminators to split the results of parameter expansion and command substitution into fields. on P2333, L74136-74137 to: The shell shall treat each character of the IFS as a delimiter and use the delimiters as field terminators to split the results of parameter expansion, command substitution, and arithmetic expansion into fields. |
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Interpretation proposed 2 May 2014 |
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Interpretation approved 25 June 2014 |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2014-04-06 08:15 | ormaaj | New Issue | |
| 2014-04-06 08:15 | ormaaj | Status | New => Under Review |
| 2014-04-06 08:15 | ormaaj | Assigned To | => ajosey |
| 2014-04-06 08:15 | ormaaj | Name | => Dan Douglas |
| 2014-04-06 08:15 | ormaaj | Section | => 2.6.5 |
| 2014-04-06 08:15 | ormaaj | Page Number | => 2333 |
| 2014-04-06 08:15 | ormaaj | Line Number | => 74133 |
| 2014-04-07 15:15 | geoffclare | Project | 2008-TC1 => 1003.1(2013)/Issue7+TC1 |
| 2014-04-10 15:40 | Don Cragun | Interp Status | => Pending |
| 2014-04-10 15:40 | Don Cragun | Note Added: 0002220 | |
| 2014-04-10 15:40 | Don Cragun | Status | Under Review => Interpretation Required |
| 2014-04-10 15:40 | Don Cragun | Resolution | Open => Accepted As Marked |
| 2014-04-10 15:41 | Don Cragun | Final Accepted Text | => See 0000832:0002220. |
| 2014-04-10 15:44 | Don Cragun | Tag Attached: tc2-2008 | |
| 2014-04-10 15:50 | Don Cragun | Note Edited: 0002220 | |
| 2014-05-02 09:27 | ajosey | Interp Status | Pending => Proposed |
| 2014-05-02 09:27 | ajosey | Note Added: 0002243 | |
| 2014-06-25 10:13 | ajosey | Interp Status | Proposed => Approved |
| 2014-06-25 10:13 | ajosey | Note Added: 0002278 | |
| 2019-06-10 08:54 | agadmin | Status | Interpretation Required => Closed |
