operations: implement "c" cmd

Does not handle correctly two addrs (should technically only "activate"
at the very end of the range), this is due to the translator having no
knowledge of what comes after two addresses and also not keeping track
of any scopes. Handling this correctly might prove quite tricky with the
current design.

README.md

@@ -151,9 +151,17 @@ Files generated.c and - are identical
 
 # Notes
 
-- Some commands are missing (currently c, l, w, r, y), and some features are
-  missing as well (empty label jumps, "#n" marker).
-  Supporting those is planned.
+- Missing commands (supporting those is planned):
+  - l
+  - r
+  - w
+  - y
+
+- Missing/incomplete features (supporting those is planned):
+  - empty label jumps
+  - #n marker
+  - c command correct behavior with 2 addresses
+  - s command nth and w options
 
 - The translator does not handle invalid sed scripts, it will just generate
   invalid C code which will probably fail to compile, make sure you can run your
@@ -164,7 +172,7 @@ Files generated.c and - are identical
   option. Also check out the [POSIX specification](https://pubs.opengroup.org/onlinepubs/9699919799/utilities/sed.html).
 
 - It is assumed no options are passed to `sed` (`-n` is a common option for
-  instance), supporting those is not planned.
+  instance), supporting those is not planned for the moment.
 
 - There are some bugs, the C code is very rough around the edges (by that I mean
   dirty and unsafe, for instance allocating everything on the stack without

operations.c

@@ -223,6 +223,12 @@ void a(Status *const status, const char *const output) {
   status->pending_output[status->pending_output_counter++] = output;
 }
 
+void c(Status *const status, const char *const output) {
+  char *const pattern_space = status->pattern_space;
+  pattern_space[0] = '\0';
+  puts(output);
+}
+
 void d(Status *const status) {
   status->pattern_space[0] = '\0';
 }

operations.h

@@ -9,6 +9,7 @@
 #define S_OPT_P 0x02
 
 void a(Status *const status, const char *const output);
+void c(Status *const status, const char *const output);
 void d(Status *const status);
 operation_ret D(Status *const status);
 void equal(const Status *const status);

par.sed

@@ -58,7 +58,7 @@ s/^[Nn]/if (&(\&status) == BREAK) break;\
 /
 t single_char_cmd
 
-s/^\([ai]\)[[:blank:]]*\\$/\1/; t ai_cmds
+s/^\([aci]\)[[:blank:]]*\\$/\1/; t aci_cmds
 
 # TODO missing cmds
 # aci
@@ -380,10 +380,10 @@ t start
 s/^/label cmds cleanup: /
 b fail
 
-: ai_cmds
+: aci_cmds
 N
 s/\\$//
-t ai_cmds
+t aci_cmds
 # remove first newline
 s/\n//
 # "\n" -> '\n'
@@ -396,6 +396,7 @@ s/[\"]/\\&/g
 s/\n/\\n/g
 s/^i\(.*\)/i("\1");/
 s/^a\(.*\)/a(\&status, "\1");/
+s/^c\(.*\)/{ c(\&status, "\1"); continue; }/
 n
 b start
 

test

@@ -397,4 +397,12 @@ bar
 baz
 funk'
 
+verify 'c \
+punk\
+dunk
+s/^/x/' 'foo
+bar
+baz
+funk'
+
 end_tests