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Document doprnt's behavior a bit better.

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This commit is contained in:
Paul Eggert 2011-04-28 15:02:15 -07:00
parent fc96fbabd3
commit f40b429dbf
1 changed files with 7 additions and 2 deletions
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9
src/doprnt.c
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@ -70,7 +70,9 @@ along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
%<flags><width><precision><length>character
where flags is [+ -0], width is [0-9]+, precision is .[0-9]+, and length
is empty or l or ll.
is empty or l or ll. Also, %% in a format stands for a single % in the
output. A % that does not introduce a valid %-sequence causes
undefined behavior.
The + flag character inserts a + before any positive number, while a space
inserts a space before any positive number; these flags only affect %d, %o,
@ -129,8 +131,11 @@ along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
/* Generate output from a format-spec FORMAT,
terminated at position FORMAT_END.
(*FORMAT_END is not part of the format, but must exist and be readable.)
Output goes in BUFFER, which has room for BUFSIZE chars.
If the output does not fit, truncate it to fit.
BUFSIZE must be positive. If the output does not fit, truncate it
to fit and return BUFSIZE - 1; if this truncates a multibyte
sequence, store '\0' into the sequence's first byte.
Returns the number of bytes stored into BUFFER, excluding
the terminating null byte. Output is always null-terminated.
String arguments are passed as C strings.