diff options
Diffstat (limited to 'editors/sed.c')
| -rw-r--r-- | editors/sed.c | 110 |
1 files changed, 64 insertions, 46 deletions
diff --git a/editors/sed.c b/editors/sed.c index a1602394..630d6d7 100644 --- a/editors/sed.c +++ b/editors/sed.c @@ -80,8 +80,8 @@ typedef struct sed_cmd_s { /* Bitfields (gcc won't group them if we don't) */ unsigned int invert:1; /* the '!' after the address */ unsigned int in_match:1; /* Next line also included in match? */ - unsigned int no_newline:1; /* Last line written by (sw) had no '\n' */ unsigned int sub_p:1; /* (s) print option */ + int last_char; /* Last line written by (sw) had no '\n' */ /* GENERAL FIELDS */ char cmd; /* The command char: abcdDgGhHilnNpPqrstwxy:={} */ @@ -712,56 +712,73 @@ static void add_input_file(FILE *file) /* Get next line of input from bbg.input_file_list, flushing append buffer and * noting if we ran out of files without a newline on the last line we read. */ -static char *get_next_line(int *no_newline) +static char *get_next_line(int *last_char) { char *temp = NULL; int len; + /* will be returned if last line in the file + * doesn't end with either '\n' or '\0' */ + *last_char = 0x100; + flush_append(); while (bbg.current_input_file < bbg.input_file_count) { - temp = bb_get_chunk_from_file(bbg.input_file_list[bbg.current_input_file],&len); + temp = bb_get_chunk_from_file( + bbg.input_file_list[bbg.current_input_file], &len); if (temp) { - *no_newline = !(len && temp[len-1] == '\n'); - if (!*no_newline) temp[len-1] = 0; + /* len > 0 here, it's ok to do temp[len-1] */ + char c = temp[len-1]; + if (c == '\n' || c == '\0') { + temp[len-1] = '\0'; + *last_char = (unsigned char)c; + } break; - // Close this file and advance to next one - } else - fclose(bbg.input_file_list[bbg.current_input_file++]); + } + /* Close this file and advance to next one */ + fclose(bbg.input_file_list[bbg.current_input_file++]); } - return temp; } -/* Output line of text. missing_newline means the last line output did not - end with a newline. no_newline means this line does not end with a - newline. */ +/* Output line of text. */ +/* Note: + * 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| + * I am not sure that bbox is wrong here... + */ -static int puts_maybe_newline(char *s, FILE *file, int missing_newline, int no_newline) +static int puts_maybe_newline(char *s, FILE *file, int prev_last_char, int last_char) { - if (missing_newline) fputc('\n',file); - fputs(s,file); - if (!no_newline) fputc('\n',file); + fputs(s, file); + if (last_char < 0x100) fputc(last_char, file); if (ferror(file)) { xfunc_error_retval = 4; /* It's what gnu sed exits with... */ bb_error_msg_and_die(bb_msg_write_error); } - return no_newline; + return last_char; } -#define sed_puts(s,n) missing_newline=puts_maybe_newline(s,bbg.nonstdout,missing_newline,n) +#define sed_puts(s, n) \ + (prev_last_char = puts_maybe_newline(s, bbg.nonstdout, prev_last_char, n)) /* Process all the lines in all the files */ static void process_files(void) { char *pattern_space, *next_line; - int linenum = 0, missing_newline = 0; - int no_newline,next_no_newline = 0; + int linenum = 0, prev_last_char = 0; + int last_char, next_last_char = 0; /* Prime the pump */ - next_line = get_next_line(&next_no_newline); + next_line = get_next_line(&next_last_char); /* go through every line in each file */ for (;;) { @@ -771,11 +788,11 @@ static void process_files(void) /* Advance to next line. Stop if out of lines. */ pattern_space = next_line; if (!pattern_space) break; - no_newline = next_no_newline; + last_char = next_last_char; /* Read one line in advance so we can act on the last line, * the '$' address */ - next_line = get_next_line(&next_no_newline); + next_line = get_next_line(&next_last_char); linenum++; restart: /* for every line, go through all the commands */ @@ -858,7 +875,7 @@ restart: /* Write the current pattern space to output */ case 'p': - sed_puts(pattern_space,no_newline); + sed_puts(pattern_space, last_char); break; /* Delete up through first newline */ case 'D': @@ -878,25 +895,24 @@ restart: /* Substitute with regex */ case 's': - if (do_subst_command(sed_cmd, &pattern_space)) { - substituted |= 1; - - /* handle p option */ - if (sed_cmd->sub_p) - sed_puts(pattern_space,no_newline); - /* handle w option */ - if (sed_cmd->file) - sed_cmd->no_newline = puts_maybe_newline(pattern_space, sed_cmd->file, sed_cmd->no_newline, no_newline); - - } + if (!do_subst_command(sed_cmd, &pattern_space)) + break; + substituted |= 1; + + /* handle p option */ + if (sed_cmd->sub_p) + sed_puts(pattern_space, last_char); + /* handle w option */ + if (sed_cmd->file) + sed_cmd->last_char = puts_maybe_newline( + pattern_space, sed_cmd->file, + sed_cmd->last_char, last_char); break; /* Append line to linked list to be printed later */ case 'a': - { append(sed_cmd->string); break; - } /* Insert text before this line */ case 'i': @@ -930,18 +946,20 @@ restart: /* Write pattern space to file. */ case 'w': - sed_cmd->no_newline = puts_maybe_newline(pattern_space,sed_cmd->file, sed_cmd->no_newline,no_newline); + sed_cmd->last_char = puts_maybe_newline( + pattern_space,sed_cmd->file, + sed_cmd->last_char, last_char); break; /* Read next line from input */ case 'n': if (!bbg.be_quiet) - sed_puts(pattern_space,no_newline); + sed_puts(pattern_space, last_char); if (next_line) { free(pattern_space); pattern_space = next_line; - no_newline = next_no_newline; - next_line = get_next_line(&next_no_newline); + last_char = next_last_char; + next_line = get_next_line(&next_last_char); linenum++; break; } @@ -970,8 +988,8 @@ restart: pattern_space = realloc(pattern_space, len + strlen(next_line) + 2); pattern_space[len] = '\n'; strcpy(pattern_space + len+1, next_line); - no_newline = next_no_newline; - next_line = get_next_line(&next_no_newline); + last_char = next_last_char; + next_line = get_next_line(&next_last_char); linenum++; } break; @@ -1029,7 +1047,7 @@ restart: strcat(pattern_space, "\n"); if (bbg.hold_space) strcat(pattern_space, bbg.hold_space); - no_newline = 0; + last_char = 0x100; break; } @@ -1061,7 +1079,7 @@ restart: { char *tmp = pattern_space; pattern_space = bbg.hold_space ? : xzalloc(1); - no_newline = 0; + last_char = 0x100; bbg.hold_space = tmp; break; } @@ -1075,7 +1093,7 @@ restart: discard_commands: /* we will print the line unless we were told to be quiet ('-n') or if the line was suppressed (ala 'd'elete) */ - if (!bbg.be_quiet) sed_puts(pattern_space,no_newline); + if (!bbg.be_quiet) sed_puts(pattern_space, last_char); /* Delete and such jump here. */ discard_line: |