1#!/bin/sh
2
3# Note: was using sed OPTS CMD -- FILES
4# but users complain that many sed implementations
5# are misinterpreting --.
6
7test $# -ge 2 || { echo "Syntax: $0 SRCTREE OBJTREE"; exit 1; }
8
9# cd to objtree
10cd -- "$2" || { echo "Syntax: $0 SRCTREE OBJTREE"; exit 1; }
11# In separate objtree build, include/ might not exist yet
12mkdir include 2>/dev/null
13
14srctree="$1"
15
16status() { printf '  %-8s%s\n' "$1" "$2"; }
17gen() { status "GEN" "$@"; }
18chk() { status "CHK" "$@"; }
19
20generate()
21{
22	# NB: data to be inserted at INSERT line is coming on stdin
23	local src="$1" dst="$2" header="$3"
24	#chk "${dst}"
25	{
26		# Need to use printf: different shells have inconsistent
27		# rules re handling of "\n" in echo params.
28		printf "%s\n" "${header}"
29		# print everything up to INSERT line
30		gsed -n '/^INSERT$/ q; p' "${src}"
31		# copy stdin to stdout
32		cat
33		# print everything after INSERT line
34		gsed -n '/^INSERT$/ {
35		:l
36		    n
37		    p
38		    bl
39		}' "${src}"
40	} >"${dst}.tmp"
41	if ! cmp -s "${dst}" "${dst}.tmp"; then
42		gen "${dst}"
43		mv "${dst}.tmp" "${dst}"
44	else
45		rm -f "${dst}.tmp"
46	fi
47}
48
49# (Re)generate include/applets.h
50gsed -n 's@^//applet:@@p' "$srctree"/*/*.c "$srctree"/*/*/*.c \
51| generate \
52	"$srctree/include/applets.src.h" \
53	"include/applets.h" \
54	"/* DO NOT EDIT. This file is generated from applets.src.h */"
55
56# (Re)generate include/usage.h
57# We add line continuation backslash after each line,
58# and insert empty line before each line which doesn't start
59# with space or tab
60TAB="$(printf '\tX')"
61TAB="${TAB%X}"
62LF="$(printf '\nX')"
63LF="${LF%X}"
64gsed -n -e 's@^//usage:\([ '"$TAB"'].*\)$@\1 \\@p' \
65       -e 's@^//usage:\([^ '"$TAB"'].*\)$@\'"$LF"'\1 \\@p' \
66	"$srctree"/*/*.c "$srctree"/*/*/*.c \
67| generate \
68	"$srctree/include/usage.src.h" \
69	"include/usage.h" \
70	"/* DO NOT EDIT. This file is generated from usage.src.h */"
71
72# (Re)generate */Kbuild and */Config.in
73# We skip .dotdirs - makes git/svn/etc users happier
74{ cd -- "$srctree" && find . -type d ! '(' -name '.?*' -prune ')'; } \
75| while read -r d; do
76	d="${d#./}"
77
78	src="$srctree/$d/Kbuild.src"
79	dst="$d/Kbuild"
80	if test -f "$src"; then
81		mkdir -p -- "$d" 2>/dev/null
82
83		gsed -n 's@^//kbuild:@@p' "$srctree/$d"/*.c \
84		| generate \
85			"${src}" "${dst}" \
86			"# DO NOT EDIT. This file is generated from Kbuild.src"
87	fi
88
89	src="$srctree/$d/Config.src"
90	dst="$d/Config.in"
91	if test -f "$src"; then
92		mkdir -p -- "$d" 2>/dev/null
93
94		gsed -n 's@^//config:@@p' "$srctree/$d"/*.c \
95		| generate \
96			"${src}" "${dst}" \
97			"# DO NOT EDIT. This file is generated from Config.src"
98	fi
99done
100
101# Last read failed. This is normal. Don't exit with its error code:
102exit 0
103