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261 lines
6.6 KiB
261 lines
6.6 KiB
// Take three word input lines on stdin and produce flag #defines to stdout.
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// The three words on each input lnie are command name, option string with
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// current config, option string from allyesconfig. The three are space
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// separated and the last two are in double quotes.
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// This is intentionally crappy code because we control the inputs. It leaks
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// memory like a sieve and segfaults if malloc returns null, but does the job.
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <ctype.h>
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struct flag {
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struct flag *next;
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char *command;
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struct flag *lopt;
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};
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int chrtype(char c)
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{
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// Does this populate a GLOBALS() variable?
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if (strchr("^-:#|@*; %.", c)) return 1;
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// Is this followed by a numeric argument in optstr?
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if (strchr("=<>", c)) return 2;
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if (strchr("?&0", c)) return 3;
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return 0;
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}
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// replace chopped out USE_BLAH() sections with low-ascii characters
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// showing how many flags got skipped so FLAG_ macros stay constant
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char *mark_gaps(char *flags, char *all)
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{
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char *n, *new, c;
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int bare = 2;
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// Shell feeds in " " for blank args, leading space not meaningful.
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while (isspace(*flags)) flags++;
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while (isspace(*all)) all++;
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n = new = strdup(all);
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while (*all) {
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// --longopt parentheticals dealt with as a unit
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if (*all == '(') {
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int len = 0;
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if (bare) bare = 1;
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while (all[len]) if (all[len++] == ')') break;
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if (strncmp(flags, all, len)) {
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// bare longopts need their own skip placeholders
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if (bare) *(new++) = 1;
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} else {
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memcpy(new, all, len);
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new += len;
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flags += len;
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}
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all += len;
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continue;
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}
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c = *(all++);
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if (bare && !chrtype(c)) bare = 0;
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if (*flags == c) {
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*(new++) = c;
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flags++;
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continue;
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}
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c = chrtype(c);
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if (!c || (!bare && c==3)) *(new++) = 1;
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else if (c==2) while (isdigit(*all)) all++;
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}
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*new = 0;
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return n;
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}
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// Break down a command string into linked list of "struct flag".
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struct flag *digest(char *string)
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{
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struct flag *list = 0;
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char *err = string, c;
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while (*string) {
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// Groups must be at end.
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if (*string == '[') break;
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// Longopts
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if (*string == '(') {
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struct flag *new = calloc(sizeof(struct flag), 1);
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new->command = ++string;
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// Attach longopt to previous short opt, if any.
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if (list && list->command) {
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new->next = list->lopt;
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list->lopt = new;
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} else {
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struct flag *blank = calloc(sizeof(struct flag), 1);
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blank->next = list;
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blank->lopt = new;
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list = blank;
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}
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// An empty longopt () would break this.
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while (*++string != ')') if (*string == '-') *string = '_';
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*(string++) = 0;
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continue;
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}
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c = chrtype(*string);
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if (c == 1 || (c == 3 && !list)) string++;
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else if (c == 2) {
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if (string[1]=='-') string++;
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if (!isdigit(string[1])) {
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fprintf(stderr, "%c without number in '%s'", *string, err);
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exit(1);
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}
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while (isdigit(*++string)) {
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if (!list) {
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string++;
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break;
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}
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}
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} else {
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struct flag *new = calloc(sizeof(struct flag), 1);
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new->command = string++;
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new->next = list;
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list = new;
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}
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}
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return list;
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}
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// Parse C-style octal escape
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void octane(char *from)
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{
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unsigned char *to = (void *)from;
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while (*from) {
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if (*from == '\\') {
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*to = 0;
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while (isdigit(*++from)) *to = (8**to)+*from-'0';
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to++;
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} else *to++ = *from++;
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}
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*to = 0;
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}
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int main(int argc, char *argv[])
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{
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char command[256], flags[1024], allflags[1024];
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char *out, *outbuf = malloc(1024*1024);
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// Yes, the output buffer is 1 megabyte with no bounds checking.
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// See "intentionally crappy", above.
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if (!(out = outbuf)) return 1;
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printf("#undef FORCED_FLAG\n#undef FORCED_FLAGLL\n"
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"#ifdef FORCE_FLAGS\n#define FORCED_FLAG 1\n#define FORCED_FLAGLL 1ULL\n"
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"#else\n#define FORCED_FLAG 0\n#define FORCED_FLAGLL 0\n#endif\n\n");
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for (;;) {
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struct flag *flist, *aflist, *offlist;
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char *mgaps = 0;
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unsigned bit;
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*command = *flags = *allflags = 0;
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bit = fscanf(stdin, "%255s \"%1023[^\"]\" \"%1023[^\"]\"\n",
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command, flags, allflags);
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octane(flags);
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octane(allflags);
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if (getenv("DEBUG"))
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fprintf(stderr, "command=%s, flags=%s, allflags=%s\n",
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command, flags, allflags);
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if (!*command) break;
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if (bit != 3) {
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fprintf(stderr, "\nError in %s (see generated/flags.raw)\n", command);
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exit(1);
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}
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bit = 0;
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printf("// %s %s %s\n", command, flags, allflags);
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if (*flags != ' ') mgaps = mark_gaps(flags, allflags);
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else if (*allflags != ' ') mgaps = allflags;
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// If command disabled, use allflags for OLDTOY()
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printf("#undef OPTSTR_%s\n#define OPTSTR_%s ", command, command);
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if (mgaps) printf("\"%s\"\n", mgaps);
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else printf("0\n");
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if (mgaps != allflags) free(mgaps);
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flist = digest(flags);
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offlist = aflist = digest(allflags);
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printf("#ifdef CLEANUP_%s\n#undef CLEANUP_%s\n#undef FOR_%s\n",
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command, command, command);
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while (offlist) {
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char *s = (char []){0, 0, 0, 0};
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if (!offlist->command) s = offlist->lopt->command;
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else {
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*s = *offlist->command;
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if (127 < (unsigned char)*s) sprintf(s, "X%02X", 127&*s);
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}
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printf("#undef FLAG_%s\n", s);
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offlist = offlist->next;
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}
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printf("#endif\n\n");
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sprintf(out, "#ifdef FOR_%s\n#ifndef TT\n#define TT this.%s\n#endif\n",
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command, command);
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out += strlen(out);
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while (aflist) {
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char *llstr = bit>30 ? "LL" : "", *s = (char []){0, 0, 0, 0};
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int enabled = 0;
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// Output flag macro for bare longopts
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if (!aflist->command) {
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s = aflist->lopt->command;
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if (flist && flist->lopt &&
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!strcmp(flist->lopt->command, aflist->lopt->command)) enabled++;
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// Output normal flag macro
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} else {
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*s = *aflist->command;
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if (127 < (unsigned char)*s) sprintf(s, "X%02X", 127&*s);
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if (flist && flist->command && *aflist->command == *flist->command)
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enabled++;
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}
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out += sprintf(out, "#define FLAG_%s (%s%s<<%d)\n",
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s, enabled ? "1" : "FORCED_FLAG", llstr, bit++);
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aflist = aflist->next;
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if (enabled) flist = flist->next;
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}
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out = stpcpy(out, "#endif\n\n");
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}
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if (fflush(0) && ferror(stdout)) return 1;
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out = outbuf;
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while (*out) {
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int i = write(1, outbuf, strlen(outbuf));
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if (i<0) return 1;
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out += i;
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}
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return 0;
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}
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