nexmon – Blame information for rev 1

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1 office 1 #! /bin/sh
2  
3 #
4 # runlex.sh
5 # Script to run Lex/Flex.
6 # First argument is the (quoted) name of the command; if it's null, that
7 # means that neither Flex nor Lex was found, so we report an error and
8 # quit.
9 #
10  
11 #
12 # Get the name of the command to run, and then shift to get the arguments.
13 #
14 if [ $# -eq 0 ]
15 then
16 echo "Usage: runlex <lex/flex command to run> [ arguments ]" 1>&2
17 exit 1
18 fi
19 LEX="$1"
20 shift
21  
22 #
23 # Check whether we have Lex or Flex.
24 #
25 if [ -z "${LEX}" ]
26 then
27 echo "Neither lex nor flex was found" 1>&2
28 exit 1
29 fi
30  
31 #
32 # Process the flags. We don't use getopt because we don't want to
33 # embed complete knowledge of what options are supported by Lex/Flex.
34 #
35 flags=""
36 outfile=lex.yy.c
37 while [ $# -ne 0 ]
38 do
39 case "$1" in
40  
41 -o*)
42 #
43 # Set the output file name.
44 #
45 outfile=`echo "$1" | sed 's/-o\(.*\)/\1/'`
46 ;;
47  
48 -*)
49 #
50 # Add this to the list of flags.
51 #
52 flags="$flags $1"
53 ;;
54  
55 --|*)
56 #
57 # End of flags.
58 #
59 break
60 ;;
61 esac
62 shift
63 done
64  
65 #
66 # Is it Lex, or is it Flex?
67 #
68 if [ "${LEX}" = flex ]
69 then
70 #
71 # It's Flex.
72 #
73 have_flex=yes
74  
75 #
76 # Does it support the --noFUNCTION options? If so, we pass
77 # --nounput, as at least some versions that support those
78 # options don't support disabling yyunput by defining
79 # YY_NO_UNPUT.
80 #
81 if flex --help | egrep noFUNCTION >/dev/null
82 then
83 flags="$flags --nounput"
84  
85 #
86 # Does it support -R, for generating reentrant scanners?
87 # If so, we're not currently using that feature, but
88 # it'll generate some unused functions anyway - and there
89 # won't be any header file declaring them, so there'll be
90 # defined-but-not-declared warnings. Therefore, we use
91 # --noFUNCTION options to suppress generating those
92 # functions.
93 #
94 if flex --help | egrep reentrant >/dev/null
95 then
96 flags="$flags --noyyget_lineno --noyyget_in --noyyget_out --noyyget_leng --noyyget_text --noyyset_lineno --noyyset_in --noyyset_out"
97 fi
98 fi
99 else
100 #
101 # It's Lex.
102 #
103 have_flex=no
104 fi
105  
106 #
107 # OK, run it.
108 # If it's lex, it doesn't support -o, so we just write to
109 # lex.yy.c and, if it succeeds, rename it to the right name,
110 # otherwise we remove lex.yy.c.
111 # If it's flex, it supports -o, so we use that - flex with -P doesn't
112 # write to lex.yy.c, it writes to a lex.{prefix from -P}.c.
113 #
114 if [ $have_flex = yes ]
115 then
116 ${LEX} $flags -o"$outfile" "$@"
117  
118 #
119 # Did it succeed?
120 #
121 status=$?
122 if [ $status -ne 0 ]
123 then
124 #
125 # No. Exit with the failing exit status.
126 #
127 exit $status
128 fi
129  
130 #
131 # Flex has the annoying habit of stripping all but the last
132 # component of the "-o" flag argument and using that as the
133 # place to put the output. This gets in the way of building
134 # in a directory different from the source directory. Try
135 # to work around this.
136 #
137 # Is the outfile where we think it is?
138 #
139 outfile_base=`basename "$outfile"`
140 if [ "$outfile_base" != "$outfile" -a \( ! -r "$outfile" \) -a -r "$outfile_base" ]
141 then
142 #
143 # No, it's not, but it is in the current directory. Put it
144 # where it's supposed to be.
145 #
146 mv "$outfile_base" "$outfile"
147  
148 #
149 # Did that succeed?
150 #
151 status=$?
152 if [ $status -ne 0 ]
153 then
154 #
155 # No. Exit with the failing exit status.
156 #
157 exit $status
158 fi
159 fi
160 else
161 ${LEX} $flags "$@"
162  
163 #
164 # Did it succeed?
165 #
166 status=$?
167 if [ $status -ne 0 ]
168 then
169 #
170 # No. Get rid of any lex.yy.c file we generated, and
171 # exit with the failing exit status.
172 #
173 rm -f lex.yy.c
174 exit $status
175 fi
176  
177 #
178 # OK, rename lex.yy.c to the right output file.
179 #
180 mv lex.yy.c "$outfile"
181  
182 #
183 # Did that succeed?
184 #
185 status=$?
186 if [ $status -ne 0 ]
187 then
188 #
189 # No. Get rid of any lex.yy.c file we generated, and
190 # exit with the failing exit status.
191 #
192 rm -f lex.yy.c
193 exit $status
194 fi
195 fi
196  
197 #
198 # OK, now let's generate a header file declaring the relevant functions
199 # defined by the .c file; if the .c file is .../foo.c, the header file
200 # will be .../foo.h.
201 #
202 # This works around some other Flex suckage, wherein it doesn't declare
203 # the lex routine before defining it, causing compiler warnings.
204 # XXX - newer versions of Flex support --header-file=, to generate the
205 # appropriate header file. With those versions, we should use that option.
206 #
207  
208 #
209 # Get the name of the prefix; scan the source files for a %option prefix
210 # line. We use the last one.
211 #
212 prefix=`sed -n 's/%option[ ][ ]*prefix="\(.*\)".*/\1/p' "$@" | tail -1`
213 if [ ! -z "$prefix" ]
214 then
215 prefixline="#define yylex ${prefix}lex"
216 fi
217  
218 #
219 # Construct the name of the header file.
220 #
221 header_file=`dirname "$outfile"`/`basename "$outfile" .c`.h
222  
223 #
224 # Spew out the declaration.
225 #
226 cat <<EOF >$header_file
227 /* This is generated by runlex.sh. Do not edit it. */
228 $prefixline
229 #ifndef YY_DECL
230 #define YY_DECL int yylex(void)
231 #endif
232 YY_DECL;
233 EOF