From e086b8387523f56cb4a43faa42fd48dc03b8a90e Mon Sep 17 00:00:00 2001 From: Christian Neukirchen Date: Mon, 25 Jul 2016 16:28:48 +0200 Subject: msort: allow multiple orderings (first different wins) Also extract mystrverscmp.c into a seperate file. --- msort.c | 162 +++++++++++++++++++++++++++++----------------------------------- 1 file changed, 74 insertions(+), 88 deletions(-) (limited to 'msort.c') diff --git a/msort.c b/msort.c index 6f72347..02ba7e1 100644 --- a/msort.c +++ b/msort.c @@ -13,20 +13,24 @@ struct mail { char *file; long idx; - union { - long intkey; - char *strkey; - } k; + char *from; + char *subj; + time_t date; + time_t mtime; + off_t size; }; struct mail *mails; ssize_t mailalloc = 1024; -int idx = 0; - -int (*sortorder)(const void *, const void *); +int idx; int rflag; +static int (*sortorders[16])(const void *, const void *); +int order_idx; + +int mystrverscmp(const char *, const char *); + char * fetch_subj(char *file) { @@ -122,15 +126,12 @@ subjorder(const void *a, const void *b) struct mail *ia = (struct mail *)a; struct mail *ib = (struct mail *)b; - if (!ia->k.strkey) - ia->k.strkey = fetch_subj(ia->file); - if (!ib->k.strkey) - ib->k.strkey = fetch_subj(ib->file); + if (!ia->subj) + ia->subj = fetch_subj(ia->file); + if (!ib->subj) + ib->subj = fetch_subj(ib->file); - int k = strcasecmp(ia->k.strkey, ib->k.strkey); - if (k == 0) - return ia->idx - ib->idx; // XXX verify - return k; + return strcasecmp(ia->subj, ib->subj); } int @@ -139,15 +140,12 @@ fromorder(const void *a, const void *b) struct mail *ia = (struct mail *)a; struct mail *ib = (struct mail *)b; - if (!ia->k.strkey) - ia->k.strkey = fetch_from(ia->file); - if (!ib->k.strkey) - ib->k.strkey = fetch_from(ib->file); + if (!ia->from) + ia->from = fetch_from(ia->file); + if (!ib->from) + ib->from = fetch_from(ib->file); - int k = strcasecmp(ia->k.strkey, ib->k.strkey); - if (k == 0) - return ia->idx - ib->idx; // XXX verify - return k; + return strcasecmp(ia->from, ib->from); } int @@ -156,15 +154,16 @@ sizeorder(const void *a, const void *b) struct mail *ia = (struct mail *)a; struct mail *ib = (struct mail *)b; - if (!ia->k.intkey) - ia->k.intkey = fetch_size(ia->file); - if (!ib->k.intkey) - ib->k.intkey = fetch_size(ib->file); + if (!ia->size) + ia->size = fetch_size(ia->file); + if (!ib->size) + ib->size = fetch_size(ib->file); - int k = ia->k.intkey - ib->k.intkey; - if (k == 0) - return ia->idx - ib->idx; // XXX verify - return k; + if (ia->size > ib->size) + return 1; + else if (ia->size < ib->size) + return -1; + return 0; } int @@ -173,15 +172,16 @@ mtimeorder(const void *a, const void *b) struct mail *ia = (struct mail *)a; struct mail *ib = (struct mail *)b; - if (!ia->k.intkey) - ia->k.intkey = fetch_mtime(ia->file); - if (!ib->k.intkey) - ib->k.intkey = fetch_mtime(ib->file); + if (!ia->mtime) + ia->mtime = fetch_mtime(ia->file); + if (!ib->mtime) + ib->mtime = fetch_mtime(ib->file); - int k = ia->k.intkey - ib->k.intkey; - if (k == 0) - return ia->idx - ib->idx; // XXX verify - return k; + if (ia->mtime > ib->mtime) + return 1; + else if (ia->mtime < ib->mtime) + return -1; + return 0; } int @@ -190,47 +190,16 @@ dateorder(const void *a, const void *b) struct mail *ia = (struct mail *)a; struct mail *ib = (struct mail *)b; - if (!ia->k.intkey) - ia->k.intkey = fetch_date(ia->file); - if (!ib->k.intkey) - ib->k.intkey = fetch_date(ib->file); - - int k = ia->k.intkey - ib->k.intkey; - if (k == 0) - return ia->idx - ib->idx; // XXX verify - return k; -} - -// taken straight from musl@a593414 -int mystrverscmp(const char *l0, const char *r0) -{ - const unsigned char *l = (const void *)l0; - const unsigned char *r = (const void *)r0; - size_t i, dp, j; - int z = 1; - - /* Find maximal matching prefix and track its maximal digit - * suffix and whether those digits are all zeros. */ - for (dp=i=0; l[i]==r[i]; i++) { - int c = l[i]; - if (!c) return 0; - if (!isdigit(c)) dp=i+1, z=1; - else if (c!='0') z=0; - } - - if (l[dp]!='0' && r[dp]!='0') { - /* If we're not looking at a digit sequence that began - * with a zero, longest digit string is greater. */ - for (j=i; isdigit(l[j]); j++) - if (!isdigit(r[j])) return 1; - if (isdigit(r[j])) return -1; - } else if (z && dpdate) + ia->date = fetch_date(ia->file); + if (!ib->date) + ib->date = fetch_date(ib->file); - return l[i] - r[i]; + if (ia->date > ib->date) + return 1; + else if (ia->date < ib->date) + return -1; + return 0; } int @@ -272,21 +241,38 @@ add(char *file) idx++; } +int +order(const void *a, const void *b) +{ + int i, r; + for (i = 0, r = 0; i < order_idx; i++) { + r = (sortorders[i])(a, b); + if (r != 0) + return r; + } + return idxorder(a, b); +} + +void +addorder(int (*sortorder)(const void *, const void *)) +{ + if (order_idx < (int) sizeof sortorders) + sortorders[order_idx++] = sortorder; +} + int main(int argc, char *argv[]) { int c, i; - sortorder = idxorder; - while ((c = getopt(argc, argv, "fdsFMSr")) != -1) switch(c) { - case 'f': sortorder = fromorder; break; - case 'd': sortorder = dateorder; break; - case 's': sortorder = subjorder; break; - case 'F': sortorder = fileorder; break; - case 'M': sortorder = mtimeorder; break; - case 'S': sortorder = sizeorder; break; + case 'f': addorder(fromorder); break; + case 'd': addorder(dateorder); break; + case 's': addorder(subjorder); break; + case 'F': addorder(fileorder); break; + case 'M': addorder(mtimeorder); break; + case 'S': addorder(sizeorder); break; case 'r': rflag = !rflag; break; default: // XXX usage @@ -303,7 +289,7 @@ main(int argc, char *argv[]) else blaze822_loop(argc-optind, argv+optind, add); - qsort(mails, idx, sizeof (struct mail), sortorder); + qsort(mails, idx, sizeof (struct mail), order); if (rflag) for (i = idx-1; i >= 0; i--) -- cgit 1.4.1