diff options
Diffstat (limited to 'Src/hist.c')
| -rw-r--r-- | Src/hist.c | 239 |
1 files changed, 138 insertions, 101 deletions
diff --git a/Src/hist.c b/Src/hist.c index 01a97da2b..87bfde882 100644 --- a/Src/hist.c +++ b/Src/hist.c @@ -2338,110 +2338,11 @@ readhistfile(char *fn, int err, int readflags) /* * Divide up the words. */ - nwordpos = 0; start = pt; uselex = isset(HISTLEXWORDS) && !(readflags & HFILE_FAST); - if (uselex) { - /* - * Attempt to do this using the lexer. - */ - LinkList wordlist = bufferwords(NULL, pt, NULL, - LEXFLAGS_COMMENTS_KEEP); - LinkNode wordnode; - int nwords_max; - nwords_max = 2 * countlinknodes(wordlist); - if (nwords_max > nwords) { - nwords = nwords_max; - words = (short *)realloc(words, nwords*sizeof(short)); - } - for (wordnode = firstnode(wordlist); - wordnode; - incnode(wordnode)) { - char *word = getdata(wordnode); - - for (;;) { - /* - * Not really an oddity: "\\\n" is - * removed from input as if whitespace. - */ - if (inblank(*pt)) - pt++; - else if (pt[0] == '\\' && pt[1] == '\n') - pt += 2; - else - break; - } - if (!strpfx(word, pt)) { - int bad = 0; - /* - * Oddity 1: newlines turn into semicolons. - */ - if (!strcmp(word, ";")) - continue; - while (*pt) { - if (!*word) { - bad = 1; - break; - } - /* - * Oddity 2: !'s turn into |'s. - */ - if (*pt == *word || - (*pt == '!' && *word == '|')) { - pt++; - word++; - } else { - bad = 1; - break; - } - } - if (bad) { -#ifdef DEBUG - dputs(ERRMSG("bad wordsplit reading history: " - "%s\nat: %s\nword: %s"), - start, pt, word); -#endif - pt = start; - nwordpos = 0; - uselex = 0; - break; - } - } else if (!strcmp(word, ";") && strpfx(";;", pt)) { - /* - * Don't get confused between a semicolon that's - * probably really a newline and a double - * semicolon that's terminating a case. - */ - continue; - } - words[nwordpos++] = pt - start; - pt += strlen(word); - words[nwordpos++] = pt - start; - } + histsplitwords(pt, &words, &nwords, &nwordpos, uselex); + if (uselex) freeheap(); - } - if (!uselex) { - do { - for (;;) { - if (inblank(*pt)) - pt++; - else if (pt[0] == '\\' && pt[1] == '\n') - pt += 2; - else - break; - } - if (*pt) { - if (nwordpos >= nwords) - words = (short *) - realloc(words, (nwords += 64)*sizeof(short)); - words[nwordpos++] = pt - start; - while (*pt && !inblank(*pt)) - pt++; - words[nwordpos++] = pt - start; - } - } while (*pt); - - } he->nwords = nwordpos/2; if (he->nwords) { @@ -3141,6 +3042,142 @@ bufferwords(LinkList list, char *buf, int *index, int flags) return list; } +/* + * Split up a line into words for use in a history file. + * + * lineptr is the line to be split. + * + * *wordsp and *nwordsp are an array already allocated to hold words + * and its length. The array holds both start and end positions, + * so *nwordsp actually counts twice the number of words in the + * original string. *nwordsp may be zero in which case the array + * will be allocated. + * + * *nwordposp returns the used length of *wordsp in the same units as + * *nwordsp, i.e. twice the number of words in the input line. + * + * If uselex is 1, attempt to do this using the lexical analyser. + * This is more accurate, but slower; for reading history files it's + * controlled by the option HISTLEXWORDS. If this failed (which + * indicates a bug in the shell) it falls back to whitespace-separated + * strings, printing a message if in debug mode. + * + * If uselex is 0, just look for whitespace-separated words; the only + * special handling is for a backslash-newline combination as used + * by the history file format to save multiline buffers. + */ +/**/ +mod_export void +histsplitwords(char *lineptr, short **wordsp, int *nwordsp, int *nwordposp, + int uselex) +{ + int nwords = *nwordsp, nwordpos = 0; + short *words = *wordsp; + char *start = lineptr; + + if (uselex) { + LinkList wordlist = bufferwords(NULL, lineptr, NULL, + LEXFLAGS_COMMENTS_KEEP); + LinkNode wordnode; + int nwords_max; + + nwords_max = 2 * countlinknodes(wordlist); + if (nwords_max > nwords) { + *nwordsp = nwords = nwords_max; + *wordsp = words = (short *)zrealloc(words, nwords*sizeof(short)); + } + for (wordnode = firstnode(wordlist); + wordnode; + incnode(wordnode)) { + char *word = getdata(wordnode); + + for (;;) { + /* + * Not really an oddity: "\\\n" is + * removed from input as if whitespace. + */ + if (inblank(*lineptr)) + lineptr++; + else if (lineptr[0] == '\\' && lineptr[1] == '\n') + lineptr += 2; + else + break; + } + if (!strpfx(word, lineptr)) { + int bad = 0; + /* + * Oddity 1: newlines turn into semicolons. + */ + if (!strcmp(word, ";")) + continue; + while (*lineptr) { + if (!*word) { + bad = 1; + break; + } + /* + * Oddity 2: !'s turn into |'s. + */ + if (*lineptr == *word || + (*lineptr == '!' && *word == '|')) { + lineptr++; + word++; + } else { + bad = 1; + break; + } + } + if (bad) { +#ifdef DEBUG + dputs(ERRMSG("bad wordsplit reading history: " + "%s\nat: %s\nword: %s"), + start, lineptr, word); +#endif + lineptr = start; + nwordpos = 0; + uselex = 0; + break; + } + } else if (!strcmp(word, ";") && strpfx(";;", lineptr)) { + /* + * Don't get confused between a semicolon that's + * probably really a newline and a double + * semicolon that's terminating a case. + */ + continue; + } + words[nwordpos++] = lineptr - start; + lineptr += strlen(word); + words[nwordpos++] = lineptr - start; + } + } + if (!uselex) { + do { + for (;;) { + if (inblank(*lineptr)) + lineptr++; + else if (lineptr[0] == '\\' && lineptr[1] == '\n') + lineptr += 2; + else + break; + } + if (*lineptr) { + if (nwordpos >= nwords) { + *nwordsp = nwords = nwords + 64; + *wordsp = words = (short *) + zrealloc(words, nwords*sizeof(*words)); + } + words[nwordpos++] = lineptr - start; + while (*lineptr && !inblank(*lineptr)) + lineptr++; + words[nwordpos++] = lineptr - start; + } + } while (*lineptr); + } + + *nwordposp = nwordpos; +} + /* Move the current history list out of the way and prepare a fresh history * list using hf for HISTFILE, hs for HISTSIZE, and shs for SAVEHIST. If * the hf value is an empty string, HISTFILE will be unset from the new |