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exstr - extract strings from source files
exstr filename...
exstr -e filename...
exstr -r [-d] filename...
The exstr utility is used to extract strings from C-language source files and replace them by calls to the message retrieval function (see gettxt(3C)). This utility will extract all character strings surrounded by double quotes, not just strings used as arguments to the printf command or the printf routine. In the first form, exstr finds all strings in the source files and writes them on the standard output. Each string is preceded by the source file name and a colon (:).
The first step is to use exstr -e to extract a list of strings and save it in a file. Next, examine this list and determine which strings can be translated and subsequently retrieved by the message retrieval function. Then, modify this file by deleting lines that can't be translated and, for lines that can be translated, by adding the message file names and the message numbers as the fourth (msgfile) and fifth (msgnum) entries on a line. The message files named must have been created by mkmsgs(1) and exist in /usr/lib/locale/locale/LC_MESSAGES . (The directory locale corresponds to the language in which the text strings are written; see setlocale(3C)). The message numbers used must correspond to the sequence numbers of strings in the message files.
Now use this modified file as input to exstr -r to produce a new version of the original C-language source file in which the strings have been replaced by calls to the message retrieval function gettxt(). The msgfile and msgnum fields are used to construct the first argument to gettxt(). The second argument to gettxt() is printed if the message retrieval fails at run-time. This argument is the null string, unless the -d option is used.
This utility cannot replace strings in all instances. For example, a static initialized character string cannot be replaced by a function call. A second example is that a string could be in a form of an escape sequence which could not be translated. In order not to break existing code, the files created by invoking exstr -e must be examined and lines containing strings not replaceable by function calls must be deleted. In some cases the code may require modifications so that strings can be extracted and replaced by calls to the message retrieval function.
The following options are supported:
-e
file:line:position:msgfile:msgnum:string
file
line
position
msgfile
msgnum
string
Normally you would redirect this output into a file. Then you would edit this file to add the values you want to use for msgfile and msgnum:
msgfile
msgnum
The next step is to use exstr -r to replace strings in file.
-r
-d
Example 1 The following examples show uses of exstr
Assume that the file example.c contains two strings:
main()
{
printf("This is an example\n");
printf("Hello world!\n");
}
The exstr utility, invoked with the argument example.c extracts strings from the named file and prints them on the standard output.
example% exstr example.c
produces the following output:
example.c:This is an example\n example.c:Hello world!\n
The exstr utility, invoked with the -e option and the argument example.c, and redirecting output to the file example.stringsout
example% exstr -e example.c > example.stringsout
produces the following output in the file example.stringsout
example.c:3:8:::This is an example\n example.c:4:8:::Hello world!\n
You must edit example.stringsout to add the values you want to use for the msgfile and msgnum fields before these strings can be replaced by calls to the retrieval function. If UX is the name of the message file, and the numbers 1 and 2 represent the sequence number of the strings in the file, here is what example.stringsout looks like after you add this information:
example.c:3:8:UX:1:This is an example\n example.c:4:8:UX:2:Hello world!\n
The exstr utility can now be invoked with the -r option to replace the strings in the source file by calls to the message retrieval function gettxt().
example% exstr -r example.c <example.stringsout >intlexample.c
produces the following output:
extern char *gettxt();
main()
{
printf(gettxt("UX:1", ""));
printf(gettxt("UX:2", ""));
}
The following example:
example% exstr -rd example.c <example.stringsout >intlexample.c
uses the extracted strings as a second argument to gettxt():
extern char *gettxt();
main()
{
printf(gettxt("UX:1", "This is an example\n"));
printf(gettxt("UX:2", "Hello world!\n"));
}
/usr/lib/locale/locale/LC_MESSAGES/*
See attributes(5) for descriptions of the following attributes:
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gettxt(1), mkmsgs(1), printf(1), srchtxt(1), gettxt(3C), printf(3C), setlocale(3C), attributes(5), environ(5)
The error messages produced by exstr are intended to be self-explanatory. They indicate errors in the command line or format errors encountered within the input file.
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