pacsort is a command line sorting utility that implements libalpm's alpm_pkg_vercmp algorithm.
Signed-off-by: Dave Reisner <[email protected]> --- On Dan's prodding and enthusiasm, I cleaned this up into a real thing: * no hard coded buffer sizes. Everything grows on demand. My initial values and growth may be a little off, but they seemed reasonable for my use cases. * support for null delimited data. Was easy enough, so why not. * support for sorting on specific column. As a necessary evil with it, support for changing the field delimiter. The default is a single space, as that's what pacman -Q uses. Unlike GNU sort, -d '\t' does what you think it does. src/util/.gitignore | 2 + src/util/Makefile.am | 6 +- src/util/pacsort.c | 397 ++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 403 insertions(+), 2 deletions(-) create mode 100644 src/util/pacsort.c diff --git a/src/util/.gitignore b/src/util/.gitignore index 2880ce2..1813506 100644 --- a/src/util/.gitignore +++ b/src/util/.gitignore @@ -2,6 +2,8 @@ .libs cleanupdelta cleanupdelta.exe +pacsort +pacsort.exe pactree pactree.exe testdb diff --git a/src/util/Makefile.am b/src/util/Makefile.am index 30a2ee3..f277465 100644 --- a/src/util/Makefile.am +++ b/src/util/Makefile.am @@ -3,7 +3,7 @@ conffile = ${sysconfdir}/pacman.conf dbpath = ${localstatedir}/lib/pacman/ cachedir = ${localstatedir}/cache/pacman/pkg/ -bin_PROGRAMS = vercmp testpkg testdb cleanupdelta pactree +bin_PROGRAMS = vercmp testpkg testdb cleanupdelta pacsort pactree DEFS = -DLOCALEDIR=\"@localedir@\" \ -DCONFFILE=\"$(conffile)\" \ @@ -27,8 +27,10 @@ testdb_LDADD = $(top_builddir)/lib/libalpm/.libs/libalpm.la cleanupdelta_SOURCES = cleanupdelta.c cleanupdelta_LDADD = $(top_builddir)/lib/libalpm/.libs/libalpm.la +pacsort_SOURCES = pacsort.c +pacsort_LDADD = $(top_builddir)/lib/libalpm/.libs/libalpm.la + pactree_SOURCES = pactree.c pactree_LDADD = $(top_builddir)/lib/libalpm/.libs/libalpm.la - # vim:set ts=2 sw=2 noet: diff --git a/src/util/pacsort.c b/src/util/pacsort.c new file mode 100644 index 0000000..04815b8 --- /dev/null +++ b/src/util/pacsort.c @@ -0,0 +1,397 @@ +/* + * pacsort.c - a sort utility implementing alpm_pkg_vercmp + * + * Copyright (c) 2010-2011 Pacman Development Team <[email protected]> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include "config.h" + +#include <errno.h> +#include <getopt.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include <alpm.h> + +#define DELIM ' ' + +struct buffer_t { + char *mem; + size_t len; + size_t maxlen; +}; + +struct list_t { + char **list; + size_t count; + size_t maxcount; +}; + +static struct options_t { + int order; + int sortkey; + int null; + char delim; +} opts; + +static struct buffer_t *buffer_new(size_t initial_size) +{ + struct buffer_t *buf; + + buf = calloc(1, sizeof(*buf)); + if(!buf) { + return NULL; + } + + buf->mem = calloc(initial_size, sizeof(char)); + if(!buf->mem) { + free(buf); + return NULL; + } + + buf->len = 0; + buf->maxlen = initial_size; + + return buf; +} + +static void buffer_free(struct buffer_t *buf) +{ + if(!buf) { + return; + } + + if(buf->mem) { + free(buf->mem); + } + + free(buf); +} + +static int buffer_grow(struct buffer_t *buffer) +{ + size_t newsz = buffer->maxlen * 2.5; + buffer->mem = realloc(buffer->mem, newsz * sizeof(char)); + if(!buffer->mem) { + return 1; + } + buffer->maxlen = newsz; + + return 0; +} + +static struct list_t *list_new(size_t initial_size) +{ + struct list_t *list; + + list = calloc(1, sizeof(struct list_t)); + if(!list) { + return NULL; + } + + list->list = calloc(initial_size, sizeof(char **)); + if(!list->list) { + free(list); + return NULL; + } + + list->maxcount = initial_size; + + return list; +} + +static int list_grow(struct list_t *list) +{ + size_t newsz = list->maxcount * 2.5; + list->list = realloc(list->list, newsz * sizeof(char*)); + if(!list->list) { + return 1; + } + + list->maxcount = newsz; + + return 0; +} + +static int list_add(struct list_t *list, char *name) +{ + if(!list|!name) { + return 1; + } + + if(list->count + 1 >= list->maxcount) { + if(list_grow(list) != 0) { + return 1; + } + } + + list->list[list->count] = name; + list->count++; + + return 0; +} + +static void list_free(struct list_t *list) +{ + size_t i; + + if(!list) { + return; + } + + if(list->list) { + for(i = 0; i < list->count; i++) { + free(list->list[i]); + } + free(list->list); + free(list); + } +} + +static char *explode(struct buffer_t *buffer, struct list_t *list) +{ + char *name, *ptr, *end; + const char linedelim = opts.null ? '\0' : '\n'; + + ptr = buffer->mem; + while((end = memchr(ptr, linedelim, &buffer->mem[buffer->len] - ptr))) { + *end = '\0'; + name = strdup(ptr); + list_add(list, name); + ptr = end + 1; + } + + return ptr; +} + +static int splitfile(FILE *stream, struct buffer_t *buffer, struct list_t *list) +{ + size_t nread; + char *ptr; + + while(1) { + /* check if a read of BUFSIZ chars will overflow */ + if (buffer->len + BUFSIZ + 1 >= buffer->maxlen) { + if(buffer_grow(buffer) != 0) { + return 1; + } + } + + nread = fread(&buffer->mem[buffer->len], 1, BUFSIZ, stream); + if(nread == 0) { + if(feof(stream)) { + if(buffer->len) { + char *name = strndup(buffer->mem, buffer->len + 1); + if(list_add(list, name) != 0) { + return 1; + } + } + break; /* EOF */ + } else { + continue; + } + } + buffer->len += nread; + + if((ptr = explode(buffer, list)) == NULL) { + return 1; + } + + if(ptr != buffer->mem) { + /* realign the data in the buffer */ + buffer->len = &buffer->mem[buffer->len] - ptr; + memmove(&buffer->mem[0], ptr, buffer->len + 1); + } + } + + return 0; +} + +/* returns a pointer to the nth column of a string without being destructive */ +static const char *nth_column(const char *string) +{ + const char *prev, *ptr; + int col; + + ptr = prev = string; + for(col = 1; ptr && col <= opts.sortkey; col++) { + prev = ptr; + ptr = strchr(ptr, opts.delim); + if(ptr) { + ptr++; + } + } + + return prev; +} + +static int vercmp(const void *p1, const void *p2) +{ + const char *name1, *name2; + + name1 = *(const char **)p1; + name2 = *(const char **)p2; + + if(opts.sortkey == 0) { + return opts.order * alpm_pkg_vercmp(name1, name2); + } else { + return opts.order * alpm_pkg_vercmp(nth_column(name1), nth_column(name2)); + } +} + +static char escape_char(const char *string) +{ + const size_t len = strlen(string); + + if(!string || len > 2) { + return -1; + } + + if(len == 1) { + return *string; + } + + if(*string != '\\') { + return -1; + } + + switch(string[1]) { + case 't': + return '\t'; + case 'n': + return '\n'; + case 'v': + return '\v'; + case '0': + return '\0'; + default: + return -1; + } +} + +static void usage(void) +{ + fprintf(stderr, "pacsort v" PACKAGE_VERSION "\n" + "Usage: pacsort [options] [files...]\n\n" + " -d, --delim DELIM field separator instead of a space\n" + " -h, --help this help message\n" + " -k, --key INDEX sort input starting on column\n" + " -r, --reverse sort in reverse order\n" + " -z, --null lines end with null bytes, not newlines\n\n"); +} + +static int parse_options(int argc, char **argv) +{ + int opt; + + static struct option opttable[] = { + {"delim", required_argument, 0, 'd'}, + {"help", no_argument, 0, 'h'}, + {"key", required_argument, 0, 'k'}, + {"reverse", no_argument, 0, 'r'}, + {"null", no_argument, 0, 'z'}, + {0, 0, 0, 0} + }; + + while((opt = getopt_long(argc, argv, "d:hk:rz", opttable, NULL)) != -1) { + switch(opt) { + case 'd': + opts.delim = escape_char(optarg); + if(opts.delim == -1) { + fprintf(stderr, "error: invalid field delimiter -- `%s'\n", optarg); + return 1; + } + break; + case 'h': + return 1; + case 'k': + opts.sortkey = (int)strtol(optarg, NULL, 10); + if(opts.sortkey <= 0) { + fprintf(stderr, "error: invalid sort key -- %s\n", optarg); + return 1; + } + break; + case 'r': + opts.order = -1; + break; + case 'z': + opts.null = 1; + break; + default: + return 1; + } + } + + return 0; +} + +int main(int argc, char *argv[]) +{ + struct list_t *list; + struct buffer_t *buffer; + size_t i; + + /* option defaults */ + opts.order = 1; + opts.delim = DELIM; + opts.sortkey = 0; + opts.null = 0; + + if(parse_options(argc, argv) != 0) { + usage(); + return 2; + } + + list = list_new(100); + buffer = buffer_new(BUFSIZ * 3); + + if(optind == argc) { + if(splitfile(stdin, buffer, list) != 0) { + fprintf(stderr, "%s: memory exhausted\n", argv[0]); + return ENOMEM; + } + } else { + while(optind < argc) { + FILE *input = fopen(argv[optind], "r"); + if(input) { + if(splitfile(input, buffer, list) != 0) { + fprintf(stderr, "%s: memory exhausted\n", argv[0]); + return ENOMEM; + } + fclose(input); + } else { + fprintf(stderr, "%s: %s: %s\n", argv[0], argv[optind], strerror(errno)); + } + optind++; + } + } + + if(list->count) { + const char linedelim = opts.null ? '\0' : '\n'; + qsort(list->list, list->count, sizeof(char *), vercmp); + for(i = 0; i < list->count; i++) { + printf("%s%c", list->list[i], linedelim); + } + list_free(list); + } + + buffer_free(buffer); + + return 0; +} + +/* vim: set ts=2 sw=2 noet: */ -- 1.7.6
