add input functions

src/input.c

@@ -0,0 +1,89 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+
+#ifdef __linux__
+#include <bsd/stdlib.h>
+#endif
+
+#include "input.h"
+
+char *get_input(const char *path) {
+    FILE *fp = NULL;
+    fp = fopen(path, "r");
+    if (fp == NULL) {
+        fprintf(stderr, "Failed to open %s. Returning NULL\n", path);
+        return NULL;
+    }
+
+    fseek(fp, 0, SEEK_END);
+    size_t fsz = ftell(fp);
+    rewind(fp);
+
+    char* buf = NULL;
+    buf = malloc(fsz + 1);
+    if (buf == NULL) {
+        fprintf(stderr, "Failed to malloc buf. Returning NULL\n");
+        fclose(fp);
+        return NULL;
+    }
+
+    fread(buf, 1, fsz, fp);
+    buf[fsz] = '\0';
+    fclose(fp);
+
+    return buf;
+}
+
+char **split(const char *s, size_t *lsz, const char *delim) {
+    char **lines = NULL;
+    char *t = strtok(s, delim);
+    size_t n = 0;
+
+    while (t != NULL) {
+        lines = realloc(lines, sizeof(char *) * ++n);
+        if (lines == NULL) {
+            fprintf(stderr, "Failed to realloc lines buffer. Returning NULL\n");
+            free(s);
+            return NULL;
+        }
+        lines[n - 1] = t;
+        t = strtok(NULL, delim);
+    }
+
+    *lsz = n;
+    return lines;
+}
+
+char **get_lines(const char *path, size_t *lsz) {
+    return split(get_input(path), lsz, "\n");
+}
+
+int *get_ints(const char *path, size_t *sz) {
+    char **lines = get_lines(path, sz);
+    int *i = malloc(sizeof(int) * *sz);
+
+    for (size_t idx = 0; idx < *sz; idx++) {
+        int n;
+        const char *errstr;
+        n = strtonum(lines[idx], INT_MIN, INT_MAX, &errstr);
+        if (errstr) {
+            printf("Failed to convert %s to int. Returning NULL\n", lines[idx]);
+            exit(1);
+        }
+        i[idx] = n;
+    }
+
+    del_lines(lines);
+    return i;
+}
+
+void del_split(char **sp) {
+    free(sp[0]);
+    free(sp);
+}
+
+void del_lines(char **lines) {
+    del_split(lines);
+}