initial commit

searchword.c

@@ -0,0 +1,93 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <dirent.h>
+#include <sys/stat.h>
+#include <errno.h>
+
+#define LINE_BUF_SIZE 8192
+
+static const char *search_word;
+static int ignore_case = 0;
+
+// Проверка вхождения подстроки с учётом регистра
+char *find_substr(const char *haystack, const char *needle) {
+    if (!ignore_case)
+        return strstr(haystack, needle);
+    // Игнорирование регистра
+    size_t nl = strlen(needle);
+    for (const char *p = haystack; *p; ++p) {
+        size_t i;
+        for (i = 0; i < nl; ++i) {
+            if (tolower((unsigned char)p[i]) != tolower((unsigned char)needle[i]))
+                break;
+        }
+        if (i == nl)
+            return (char*)p;
+    }
+    return NULL;
+}
+
+void search_file(const char *filepath) {
+    FILE *f = fopen(filepath, "r");
+    if (!f) return;  // не удалось открыть — пропустить
+    char line[LINE_BUF_SIZE];
+    unsigned long lineno = 0;
+    while (fgets(line, sizeof(line), f)) {
+        lineno++;
+        if (find_substr(line, search_word)) {
+            printf("%s:%lu: %s", filepath, lineno, line);
+        }
+    }
+    fclose(f);
+}
+
+void process_dir(const char *path) {
+    DIR *d = opendir(path);
+    if (!d) return;
+    struct dirent *entry;
+    while ((entry = readdir(d)) != NULL) {
+        if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0)
+            continue;
+        char fullpath[PATH_MAX];
+        snprintf(fullpath, sizeof(fullpath), "%s/%s", path, entry->d_name);
+        struct stat st;
+        if (stat(fullpath, &st) == -1) continue;
+        if (S_ISDIR(st.st_mode)) {
+            process_dir(fullpath);
+        } else if (S_ISREG(st.st_mode)) {
+            search_file(fullpath);
+        }
+    }
+    closedir(d);
+}
+
+int main(int argc, char *argv[]) {
+    const char *dir = NULL;
+    int argi = 1;
+    if (argc > 1 && strcmp(argv[1], "-i") == 0) {
+        ignore_case = 1;
+        argi++;
+    }
+    if (argi < argc)
+        dir = argv[argi++];
+    else {
+        const char *home = getenv("HOME");
+        if (!home) {
+            fprintf(stderr, "Не задана директория и переменная HOME не установлена.\n");
+            return EXIT_FAILURE;
+        }
+        static char default_dir[PATH_MAX];
+        snprintf(default_dir, sizeof(default_dir), "%s/", home);
+        dir = default_dir;
+    }
+    if (argi < argc)
+        search_word = argv[argi];
+    else {
+        fprintf(stderr, "Использование: %s [-i] [директория] слово\n", argv[0]);
+        return EXIT_FAILURE;
+    }
+    process_dir(dir);
+    return EXIT_SUCCESS;
+}