219 lines
4.3 KiB
C
219 lines
4.3 KiB
C
/*
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* Simple functions to access files.
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*
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* Taken from lscpu.c
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*
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* Copyright (C) 2008 Cai Qian <qcai@redhat.com>
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* Copyright (C) 2008 Karel Zak <kzak@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <stdarg.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <errno.h>
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#include "all-io.h"
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#include "cpuset.h"
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#include "path.h"
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#include "nls.h"
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#include "c.h"
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static size_t prefixlen;
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static char pathbuf[PATH_MAX];
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static const char *
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path_vcreate(const char *path, va_list ap)
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{
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if (prefixlen)
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vsnprintf(pathbuf + prefixlen,
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sizeof(pathbuf) - prefixlen, path, ap);
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else
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vsnprintf(pathbuf, sizeof(pathbuf), path, ap);
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return pathbuf;
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}
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static FILE *
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path_vfopen(const char *mode, int exit_on_error, const char *path, va_list ap)
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{
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FILE *f;
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const char *p = path_vcreate(path, ap);
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f = fopen(p, mode);
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if (!f && exit_on_error)
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err(EXIT_FAILURE, _("cannot open %s"), p);
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return f;
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}
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static int
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path_vopen(int flags, const char *path, va_list ap)
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{
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int fd;
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const char *p = path_vcreate(path, ap);
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fd = open(p, flags);
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if (fd == -1)
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err(EXIT_FAILURE, _("cannot open %s"), p);
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return fd;
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}
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FILE *
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path_fopen(const char *mode, int exit_on_error, const char *path, ...)
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{
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FILE *fd;
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va_list ap;
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va_start(ap, path);
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fd = path_vfopen(mode, exit_on_error, path, ap);
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va_end(ap);
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return fd;
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}
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void
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path_getstr(char *result, size_t len, const char *path, ...)
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{
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FILE *fd;
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va_list ap;
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va_start(ap, path);
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fd = path_vfopen("r", 1, path, ap);
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va_end(ap);
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if (!fgets(result, len, fd))
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err(EXIT_FAILURE, _("failed to read: %s"), pathbuf);
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fclose(fd);
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len = strlen(result);
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if (result[len - 1] == '\n')
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result[len - 1] = '\0';
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}
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int
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path_getnum(const char *path, ...)
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{
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FILE *fd;
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va_list ap;
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int result;
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va_start(ap, path);
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fd = path_vfopen("r", 1, path, ap);
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va_end(ap);
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if (fscanf(fd, "%d", &result) != 1) {
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if (ferror(fd))
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err(EXIT_FAILURE, _("failed to read: %s"), pathbuf);
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else
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errx(EXIT_FAILURE, _("parse error: %s"), pathbuf);
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}
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fclose(fd);
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return result;
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}
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int
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path_writestr(const char *str, const char *path, ...)
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{
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int fd, result;
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va_list ap;
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va_start(ap, path);
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fd = path_vopen(O_WRONLY, path, ap);
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va_end(ap);
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result = write_all(fd, str, strlen(str));
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close(fd);
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return result;
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}
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int
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path_exist(const char *path, ...)
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{
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va_list ap;
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const char *p;
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va_start(ap, path);
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p = path_vcreate(path, ap);
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va_end(ap);
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return access(p, F_OK) == 0;
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}
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static cpu_set_t *
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path_cpuparse(int maxcpus, int islist, const char *path, va_list ap)
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{
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FILE *fd;
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cpu_set_t *set;
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size_t setsize, len = maxcpus * 7;
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char buf[len];
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fd = path_vfopen("r", 1, path, ap);
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if (!fgets(buf, len, fd))
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err(EXIT_FAILURE, _("failed to read: %s"), pathbuf);
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fclose(fd);
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len = strlen(buf);
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if (buf[len - 1] == '\n')
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buf[len - 1] = '\0';
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set = cpuset_alloc(maxcpus, &setsize, NULL);
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if (!set)
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err(EXIT_FAILURE, _("failed to callocate cpu set"));
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if (islist) {
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if (cpulist_parse(buf, set, setsize, 0))
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errx(EXIT_FAILURE, _("failed to parse CPU list %s"), buf);
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} else {
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if (cpumask_parse(buf, set, setsize))
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errx(EXIT_FAILURE, _("failed to parse CPU mask %s"), buf);
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}
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return set;
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}
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cpu_set_t *
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path_cpuset(int maxcpus, const char *path, ...)
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{
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va_list ap;
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cpu_set_t *set;
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va_start(ap, path);
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set = path_cpuparse(maxcpus, 0, path, ap);
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va_end(ap);
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return set;
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}
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cpu_set_t *
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path_cpulist(int maxcpus, const char *path, ...)
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{
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va_list ap;
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cpu_set_t *set;
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va_start(ap, path);
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set = path_cpuparse(maxcpus, 1, path, ap);
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va_end(ap);
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return set;
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}
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void
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path_setprefix(const char *prefix)
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{
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prefixlen = strlen(prefix);
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strncpy(pathbuf, prefix, sizeof(pathbuf));
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pathbuf[sizeof(pathbuf) - 1] = '\0';
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}
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