3653fb6b15
Add a special LOG_OOM() function to log all OutOfMemory errors (i.e. allocations returning NULL).
82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
#include "util/file.h"
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#include <limits.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "util/log.h"
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bool
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sc_file_executable_exists(const char *file) {
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char *path = getenv("PATH");
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if (!path)
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return false;
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path = strdup(path);
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if (!path)
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return false;
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bool ret = false;
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size_t file_len = strlen(file);
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char *saveptr;
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for (char *dir = strtok_r(path, ":", &saveptr); dir;
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dir = strtok_r(NULL, ":", &saveptr)) {
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size_t dir_len = strlen(dir);
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char *fullpath = malloc(dir_len + file_len + 2);
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if (!fullpath)
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{
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LOG_OOM();
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continue;
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}
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memcpy(fullpath, dir, dir_len);
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fullpath[dir_len] = '/';
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memcpy(fullpath + dir_len + 1, file, file_len + 1);
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struct stat sb;
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bool fullpath_executable = stat(fullpath, &sb) == 0 &&
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sb.st_mode & S_IXUSR;
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free(fullpath);
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if (fullpath_executable) {
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ret = true;
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break;
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}
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}
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free(path);
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return ret;
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}
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char *
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sc_file_get_executable_path(void) {
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// <https://stackoverflow.com/a/1024937/1987178>
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#ifdef __linux__
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char buf[PATH_MAX + 1]; // +1 for the null byte
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ssize_t len = readlink("/proc/self/exe", buf, PATH_MAX);
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if (len == -1) {
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perror("readlink");
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return NULL;
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}
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buf[len] = '\0';
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return strdup(buf);
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#else
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// in practice, we only need this feature for portable builds, only used on
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// Windows, so we don't care implementing it for every platform
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// (it's useful to have a working version on Linux for debugging though)
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return NULL;
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#endif
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}
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bool
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sc_file_is_regular(const char *path) {
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struct stat path_stat;
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if (stat(path, &path_stat)) {
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perror("stat");
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return false;
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}
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return S_ISREG(path_stat.st_mode);
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}
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