diff options
Diffstat (limited to 'editors')
| -rw-r--r-- | editors/sed.c | 134 |
1 files changed, 67 insertions, 67 deletions
diff --git a/editors/sed.c b/editors/sed.c index 5577f35..9713758 100644 --- a/editors/sed.c +++ b/editors/sed.c @@ -851,37 +851,79 @@ static void append(char *s) llist_add_to_end(&G.append_head, s); } -static void flush_append(void) +/* Output line of text. */ +/* Note: + * The tricks with NO_EOL_CHAR and last_puts_char are there to emulate gnu sed. + * Without them, we had this: + * echo -n thingy >z1 + * echo -n again >z2 + * >znull + * sed "s/i/z/" z1 z2 znull | hexdump -vC + * output: + * gnu sed 4.1.5: + * 00000000 74 68 7a 6e 67 79 0a 61 67 61 7a 6e |thzngy.agazn| + * bbox: + * 00000000 74 68 7a 6e 67 79 61 67 61 7a 6e |thzngyagazn| + */ +enum { + NO_EOL_CHAR = 1, + LAST_IS_NUL = 2, +}; +static void puts_maybe_newline(char *s, FILE *file, char *last_puts_char, char last_gets_char) +{ + char lpc = *last_puts_char; + + /* Need to insert a '\n' between two files because first file's + * last line wasn't terminated? */ + if (lpc != '\n' && lpc != '\0') { + fputc('\n', file); + lpc = '\n'; + } + fputs(s, file); + + /* 'x' - just something which is not '\n', '\0' or NO_EOL_CHAR */ + if (s[0]) + lpc = 'x'; + + /* had trailing '\0' and it was last char of file? */ + if (last_gets_char == LAST_IS_NUL) { + fputc('\0', file); + lpc = 'x'; /* */ + } else + /* had trailing '\n' or '\0'? */ + if (last_gets_char != NO_EOL_CHAR) { + fputc(last_gets_char, file); + lpc = last_gets_char; + } + + if (ferror(file)) { + xfunc_error_retval = 4; /* It's what gnu sed exits with... */ + bb_error_msg_and_die(bb_msg_write_error); + } + *last_puts_char = lpc; +} + +static void flush_append(char *last_puts_char, char last_gets_char) { char *data; /* Output appended lines. */ while ((data = (char *)llist_pop(&G.append_head))) { - fprintf(G.nonstdout, "%s\n", data); + puts_maybe_newline(data, G.nonstdout, last_puts_char, last_gets_char); free(data); } } -static void add_input_file(FILE *file) -{ - G.input_file_list = xrealloc_vector(G.input_file_list, 2, G.input_file_count); - G.input_file_list[G.input_file_count++] = file; -} - /* Get next line of input from G.input_file_list, flushing append buffer and * noting if we ran out of files without a newline on the last line we read. */ -enum { - NO_EOL_CHAR = 1, - LAST_IS_NUL = 2, -}; -static char *get_next_line(char *gets_char) +static char *get_next_line(char *gets_char, char *last_puts_char, char last_gets_char) { char *temp = NULL; int len; char gc; - flush_append(); + flush_append(last_puts_char, last_gets_char); /* will be returned if last line in the file * doesn't end with either '\n' or '\0' */ @@ -925,54 +967,6 @@ static char *get_next_line(char *gets_char) return temp; } -/* Output line of text. */ -/* Note: - * The tricks with NO_EOL_CHAR and last_puts_char are there to emulate gnu sed. - * Without them, we had this: - * echo -n thingy >z1 - * echo -n again >z2 - * >znull - * sed "s/i/z/" z1 z2 znull | hexdump -vC - * output: - * gnu sed 4.1.5: - * 00000000 74 68 7a 6e 67 79 0a 61 67 61 7a 6e |thzngy.agazn| - * bbox: - * 00000000 74 68 7a 6e 67 79 61 67 61 7a 6e |thzngyagazn| - */ -static void puts_maybe_newline(char *s, FILE *file, char *last_puts_char, char last_gets_char) -{ - char lpc = *last_puts_char; - - /* Need to insert a '\n' between two files because first file's - * last line wasn't terminated? */ - if (lpc != '\n' && lpc != '\0') { - fputc('\n', file); - lpc = '\n'; - } - fputs(s, file); - - /* 'x' - just something which is not '\n', '\0' or NO_EOL_CHAR */ - if (s[0]) - lpc = 'x'; - - /* had trailing '\0' and it was last char of file? */ - if (last_gets_char == LAST_IS_NUL) { - fputc('\0', file); - lpc = 'x'; /* */ - } else - /* had trailing '\n' or '\0'? */ - if (last_gets_char != NO_EOL_CHAR) { - fputc(last_gets_char, file); - lpc = last_gets_char; - } - - if (ferror(file)) { - xfunc_error_retval = 4; /* It's what gnu sed exits with... */ - bb_error_msg_and_die(bb_msg_write_error); - } - *last_puts_char = lpc; -} - #define sed_puts(s, n) (puts_maybe_newline(s, G.nonstdout, &last_puts_char, n)) static int beg_match(sed_cmd_t *sed_cmd, const char *pattern_space) @@ -995,7 +989,7 @@ static void process_files(void) int substituted; /* Prime the pump */ - next_line = get_next_line(&next_gets_char); + next_line = get_next_line(&next_gets_char, &last_puts_char, '\n' /*last_gets_char*/); /* Go through every line in each file */ again: @@ -1009,7 +1003,7 @@ static void process_files(void) /* Read one line in advance so we can act on the last line, * the '$' address */ - next_line = get_next_line(&next_gets_char); + next_line = get_next_line(&next_gets_char, &last_puts_char, last_gets_char); linenum++; /* For every line, go through all the commands */ @@ -1227,7 +1221,7 @@ static void process_files(void) free(pattern_space); pattern_space = next_line; last_gets_char = next_gets_char; - next_line = get_next_line(&next_gets_char); + next_line = get_next_line(&next_gets_char, &last_puts_char, last_gets_char); substituted = 0; linenum++; break; @@ -1263,7 +1257,7 @@ static void process_files(void) pattern_space[len] = '\n'; strcpy(pattern_space + len+1, next_line); last_gets_char = next_gets_char; - next_line = get_next_line(&next_gets_char); + next_line = get_next_line(&next_gets_char, &last_puts_char, last_gets_char); linenum++; break; } @@ -1367,7 +1361,7 @@ static void process_files(void) /* Delete and such jump here. */ discard_line: - flush_append(); + flush_append(&last_puts_char, last_gets_char); free(pattern_space); goto again; @@ -1394,6 +1388,12 @@ static void add_cmd_block(char *cmdstr) free(sv); } +static void add_input_file(FILE *file) +{ + G.input_file_list = xrealloc_vector(G.input_file_list, 2, G.input_file_count); + G.input_file_list[G.input_file_count++] = file; +} + int sed_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int sed_main(int argc UNUSED_PARAM, char **argv) { |