diff options
| -rw-r--r-- | editors/patch.c | 136 |
1 files changed, 67 insertions, 69 deletions
diff --git a/editors/patch.c b/editors/patch.c index e0fb58f..7b39160 100644 --- a/editors/patch.c +++ b/editors/patch.c @@ -44,23 +44,23 @@ static unsigned copy_lines(FILE *src_stream, FILE *dest_stream, unsigned lines_c * returns malloc'ed filename * NB: frees 1st argument! */ -static char *extract_filename_and_free_line(char *line, int patch_level) +static char *extract_filename(char *line, int patch_level, const char *pat) { - char *temp, *filename_start_ptr = line + 4; + char *temp = NULL, *filename_start_ptr = line + 4; - /* Terminate string at end of source filename */ - temp = strchrnul(filename_start_ptr, '\t'); - *temp = '\0'; + if (strncmp(line, pat, 4) == 0) { + /* Terminate string at end of source filename */ + line[strcspn(line,"\t\n\r")] = '\0'; - /* Skip over (patch_level) number of leading directories */ - while (patch_level--) { - temp = strchr(filename_start_ptr, '/'); - if (!temp) - break; - filename_start_ptr = temp + 1; + /* Skip over (patch_level) number of leading directories */ + while (patch_level--) { + temp = strchr(filename_start_ptr, '/'); + if (!temp) + break; + filename_start_ptr = temp + 1; + } + temp = xstrdup(filename_start_ptr); } - - temp = xstrdup(filename_start_ptr); free(line); return temp; } @@ -100,30 +100,26 @@ int patch_main(int argc ATTRIBUTE_UNUSED, char **argv) /* Skip everything upto the "---" marker * No need to parse the lines "Only in <dir>", and "diff <args>" */ - while (strncmp(patch_line, "--- ", 4) != 0) { - free(patch_line); + do { + /* Extract the filename used before the patch was generated */ + original_filename = extract_filename(patch_line, patch_level, "--- "); patch_line = xmalloc_getline(patch_file); - if (!patch_line) - bb_error_msg_and_die("invalid patch"); - } - - /* Extract the filename used before the patch was generated */ - original_filename = extract_filename_and_free_line(patch_line, patch_level); + if (!patch_line) goto quit; + } while (!original_filename); - patch_line = xmalloc_getline(patch_file); - if (!patch_line || strncmp(patch_line, "+++ ", 4) != 0) + new_filename = extract_filename(patch_line, patch_level, "+++ "); + if (!new_filename) { bb_error_msg_and_die("invalid patch"); - new_filename = extract_filename_and_free_line(patch_line, patch_level); + } - /* Get access rights from the file to be patched, -1 file does not exist */ + /* Get access rights from the file to be patched */ if (stat(new_filename, &saved_stat) != 0) { - char *line_ptr; - /* Create leading directories */ - line_ptr = strrchr(new_filename, '/'); - if (line_ptr) { - *line_ptr = '\0'; + char *slash = strrchr(new_filename, '/'); + if (slash) { + /* Create leading directories */ + *slash = '\0'; bb_make_directory(new_filename, -1, FILEUTILS_RECUR); - *line_ptr = '/'; + *slash = '/'; } backup_filename = NULL; saved_stat.st_mode = 0644; @@ -134,10 +130,16 @@ int patch_main(int argc ATTRIBUTE_UNUSED, char **argv) dst_stream = xfopen(new_filename, "w"); fchmod(fileno(dst_stream), saved_stat.st_mode); src_stream = NULL; - - if (backup_filename && !stat(original_filename, &saved_stat)) { - src_stream = xfopen((strcmp(original_filename, new_filename)) ? - original_filename : backup_filename, "r"); + if (backup_filename && stat(original_filename, &saved_stat) == 0) { + // strcmp() is never 0! Otherwise: + // original_filename == new_filename, + // stat(original_filename) == stat(new_filename), + // stat(new_filename) == 0, + // but we renamed new_filename if it existed! + // stat() must fail! + //src_stream = xfopen((strcmp(original_filename, new_filename)) ? + // original_filename : backup_filename, "r"); + src_stream = xfopen(original_filename, "r"); } printf("patching file %s\n", new_filename); @@ -147,16 +149,12 @@ int patch_main(int argc ATTRIBUTE_UNUSED, char **argv) while (patch_line) { unsigned count; unsigned src_beg_line; - unsigned unused; - unsigned hunk_offset_start = 0; - smallint hunk_error = 0; - - /* This bit should be improved */ - if ((sscanf(patch_line, "@@ -%d,%d +%d,%d @@", &src_beg_line, &unused, &dest_beg_line, &unused) != 4) - && (sscanf(patch_line, "@@ -%d,%d +%d @@", &src_beg_line, &unused, &dest_beg_line) != 3) - && (sscanf(patch_line, "@@ -%d +%d,%d @@", &src_beg_line, &dest_beg_line, &unused) != 3) - ) { - /* No more hunks for this file */ + unsigned hunk_offset_start; + unsigned src_last_line = 1; + + if ((sscanf(patch_line, "@@ -%d,%d +%d", &src_beg_line, &src_last_line, &dest_beg_line) != 3) + && (sscanf(patch_line, "@@ -%d +%d", &src_beg_line, &dest_beg_line) != 2) + ) { /* No more hunks for this file */ break; } hunk_count++; @@ -172,14 +170,22 @@ int patch_main(int argc ATTRIBUTE_UNUSED, char **argv) dest_cur_line += count; copy_trailing_lines_flag = 1; } - hunk_offset_start = src_cur_line; + src_last_line += hunk_offset_start = src_cur_line; while (1) { free(patch_line); patch_line = xmalloc_fgets(patch_file); - if (patch_line == NULL) break; - if ((*patch_line == '-') || (*patch_line == ' ')) { + if (patch_line == NULL) + break; /* EOF */ + if ((*patch_line != '-') && (*patch_line != '+') + && (*patch_line != ' ') + ) { + break; /* End of hunk */ + } + if (*patch_line != '+') { /* '-', ' ' or '\n' */ char *src_line = NULL; + if (src_cur_line == src_last_line) + break; if (src_stream) { src_line = xmalloc_fgets(src_stream); if (src_line) { @@ -188,26 +194,19 @@ int patch_main(int argc ATTRIBUTE_UNUSED, char **argv) free(src_line); if (diff) src_line = NULL; } - if (!src_line) { - bb_error_msg("hunk #%d FAILED at %d", hunk_count, hunk_offset_start); - hunk_error = 1; - break; - } } - if (*patch_line == ' ') { - fputs(patch_line + 1, dst_stream); - dest_cur_line++; + if (!src_line) { + bb_error_msg("hunk #%u FAILED at %u", hunk_count, hunk_offset_start); + bad_hunk_count++; + break; + } + if (*patch_line == '-') { + continue; } - } else if (*patch_line == '+') { - fputs(patch_line + 1, dst_stream); - dest_cur_line++; - } else { - break; } + fputs(patch_line + 1, dst_stream); + dest_cur_line++; } /* end of while loop handling one hunk */ - if (hunk_error) { - bad_hunk_count++; - } } /* end of while loop handling one file */ /* Cleanup last patched file */ @@ -217,9 +216,7 @@ int patch_main(int argc ATTRIBUTE_UNUSED, char **argv) if (src_stream) { fclose(src_stream); } - if (dst_stream) { - fclose(dst_stream); - } + fclose(dst_stream); if (bad_hunk_count) { ret = 1; bb_error_msg("%u out of %u hunk FAILED", bad_hunk_count, hunk_count); @@ -232,11 +229,12 @@ int patch_main(int argc ATTRIBUTE_UNUSED, char **argv) if ((dest_cur_line == 0) || (dest_beg_line == 0)) { /* The new patched file is empty, remove it */ xunlink(new_filename); - if (strcmp(new_filename, original_filename) != 0) - xunlink(original_filename); + /* original_filename and new_filename may be the same file */ + unlink(original_filename); } } } /* end of "while there are patch lines" */ +quit: /* 0 = SUCCESS * 1 = Some hunks failed |