Right, here's another version. Could you please have another read
through, Stephane
NOTES
The GNU C library supports a non-standard extension that causes
the library to dynamically allocate a string of sufficient size
for input strings for the %s and %a[range] conversion
specifiers. To make use of this feature, specify a as a length
modifier (thus %as or %a[range]). The caller must free(3) the
returned string, as in the following example:
char *p;
int n;
errno = 0;
n = scanf("%a[a-z]", &p);
printf("n=%d, errno=%d\n", n, errno);
if (n == 1) {
printf("read: %s\n", p);
free(p);
} else if (errno != 0) {
perror("scanf");
} else {
fprintf(stderr, "No matching characters\n"):
}
As shown in the above example, it is only necessary to call
free(3) if the scanf() call successfully read a string.
The a modifier is not available if the program is compiled with
gcc -std=c99 or gcc -D_ISOC99_SOURCE (unless _GNU_SOURCE is
also specified), in which case the a is interpreted as a speci-
fier for floating point numbers (see above).
Since version 2.7, glibc also provides the m modifier for the
same purpose as the a modifier. The m modifier has the follow-
ing advantages:
* It may also be applied to %c conversion specifiers (e.g.,
%3mc).
* It avoids ambiguity with respect to the %a floating-point
conversion specifier (and is unaffected by gcc -std=c99 etc.)
* It is specified in the upcoming revision of the POSIX.1 stan-
dard.
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