Add support for %0d format specifier to base m4

Hi,

current ocaml uses %02d format specifier in its autoconf. This is not
supported by our base m4. I had no idea how to force autoconf to use
devel/m4. So I added support for this flag to base m4. OK?
Alternatively suggestions are welcome how to force use of
/usr/local/bin/gm4 instead of /usr/bin/m4.

Christopher


Index: gnum4.c
===================================================================
RCS file: /cvs/src/usr.bin/m4/gnum4.c,v
retrieving revision 1.52
diff -u -p -r1.52 gnum4.c
--- gnum4.c 21 Aug 2017 21:41:13 -0000 1.52
+++ gnum4.c 4 Dec 2021 12:41:43 -0000
@@ -542,12 +542,12 @@ doformat(const char *argv[], int argc)
{
const char *format = argv[2];
int pos = 3;
- int left_padded;
- long width;
+ int left_padded, fill_0 = 0;
+ int width;
size_t l;
const char *thisarg;
- char temp[2];
- long extra;
+ char temp[32];
+ long extra, number;

while (*format != 0) {
if (*format != '%') {
@@ -564,15 +564,19 @@ doformat(const char *argv[], int argc)
addchar('%');
break;
}
+ if (*format == '0') {
+ format++;
+ fill_0 = 1;
+ }

if (*format == '*') {
format++;
if (pos >= argc)
m4errx(1,
"Format with too many format specifiers.");
- width = strtol(argv[pos++], NULL, 10);
+ width = (int)strtol(argv[pos++], NULL, 10);
} else {
- width = strtol(format, (char **)&format, 10);
+ width = (int)strtol(format, (char **)&format, 10);
}
if (width < 0) {
left_padded = 1;
@@ -599,6 +603,18 @@ doformat(const char *argv[], int argc)
switch(*format) {
case 's':
thisarg = argv[pos++];
+ break;
+ case 'd':
+ number = strtol(argv[pos], (char **)&thisarg, 0);
+ if (*argv[pos] == '\0' || *thisarg != '\0')
+ m4errx(1,
+ "Unexpected argument to %%d format specifier: %s.",
+ argv[pos]);
+ pos ++;
+ snprintf(temp, sizeof(temp),
+ fill_0 ? "%0*ld" : "%*ld",
+ left_padded ? -width : width, number);
+ thisarg = temp;
break;
case 'c':
temp[0] = strtoul(argv[pos++], NULL, 10);
Index: m4.1
===================================================================
RCS file: /cvs/src/usr.bin/m4/m4.1,v
retrieving revision 1.65
diff -u -p -r1.65 m4.1
--- m4.1 8 Mar 2021 02:47:28 -0000 1.65
+++ m4.1 4 Dec 2021 12:41:43 -0000
@@ -290,8 +290,8 @@ and following arguments, in a way simila
.Xr printf 3 .
This built-in is only available in GNU-m4 compatibility mode, and the only
parameters implemented are there for autoconf compatibility:
-left-padding flag, an optional field width, a maximum field width,
-*-specified field widths, and the %s and %c data type.
+left-padding flag, pad with leading zeros flag, an optional field width, a
+maximum field width, *-specified field widths, and the %d, %s and %c data type.
.It Fn ifdef name yes no
If the macro named by the first argument is defined then return the second
argument, otherwise the third.