1 files changed, 134 insertions, 0 deletions
diff --git a/src/util/shared.c b/src/util/shared.c
new file mode 100644
index 0000000..c5c22e9
--- /dev/null
+++ b/src/util/shared.c
@@ -0,0 +1,134 @@
+#include "shared.h"
+
+#include <errno.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <sys/stat.h>
+
+void error(const char* format, ...) {
+    va_list list;
+    va_start(list, format);
+
+    vfprintf(stderr, format, list);
+    fprintf(stderr, "\n");
+    exit(EXIT_FAILURE);
+}
+
+FILE* get_file_s(const char* path, const char* type) {
+    struct stat s;
+    if (lstat(path, &s) < 0) {
+        if (type[0] != 'r') goto read;
+        fprintf(stderr, "error: failed to read %s: %s\n", path, strerror(errno));
+        return NULL;
+    }
+    if (S_ISDIR(s.st_mode)) {
+        fprintf(stderr, "error: %s is a directory\n", path);
+        return NULL;
+    }
+
+    FILE* file;
+read:
+    file = fopen(path, type);
+    if (file == NULL) {
+        fprintf(stderr, "error: failed to open file %s: %s\n", path, strerror(errno));
+    }
+    return file;
+}
+
+FILE* get_file(const char* path, const char* type) {
+    if (streql("-", path) && type[0] == 'r') {
+        clearerr(stdin);
+        return stdin;
+    }
+    FILE* file = get_file_s(path, type);
+    if (file == NULL) exit(EXIT_FAILURE);
+    return file;
+}
+
+long int get_number(const char* text) {
+    char* end;
+    long int n = strtol(text, &end, 10);
+    if (text == end) {
+        error("error: %s is not a valid number", text);
+    }
+    return n;
+}
+
+long int get_blkm(const char* text) {
+    char* end;
+    long int n = strtol(text, &end, 10);
+    if (text == end) {
+        error("error: %s is not a valid bkm", text);
+    }
+    if (*end == '\0') return n;
+    switch (*end) {
+        case 'K':
+        case 'k':
+            return n * 1024;
+        case 'B':
+        case 'b':
+            return n * 512;
+        case 'M':
+        case 'm':
+            return n * 1024 * 1204;
+        default:
+            error("error: invalid bkm type %c", *end);
+    }
+    // shouldnt get here anyways
+    return 0;
+}
+
+bool streql(const char* a, const char* b) {
+    if (*a != *b) return false;
+    int n = 0;
+    while (true) {
+        if (*(a+n) != *(b+n)) return false;
+        if (*(a+n) == '\0') return true;
+        ++n;
+    }
+}
+
+bool prefix(const char* pre, const char* str) {
+    return strncmp(pre, str, strlen(pre)) == 0;
+}
+
+static char fs_types[5] = {'K','M','G','T','P'};
+void print_file_size(size_t bytes, char buf[5]) {
+    int index = 0;
+    float next = bytes;
+    while (true) {
+        if (next < 1000) {
+            break;
+        }
+        if (index == 5) {
+            printf("999P");
+            return;
+        };
+        next /= 1024;
+        index++;
+    }
+    
+    int n = snprintf(buf, 4, "%u", (int)(next+.5));
+    if (index > 0) {
+        buf[n] = (fs_types[index - 1]);
+        n++;
+    }
+    buf[n] = '\0';
+}
+
+static char* months[12] = 
+    {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
+void print_date_time(time_t mills, char buf[13]) {
+    struct tm* info;
+    info = localtime(&mills);
+    int n = snprintf(buf, 5, "%s ", months[info->tm_mon]);
+
+    if (info->tm_mday < 10) {
+        buf[n] = ' ';
+        n++;
+    }
+
+    snprintf(buf + n, 13 - n, "%d %02d:%02d ", info->tm_mday, info->tm_hour, info->tm_sec);
+}