mystring.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <ctype.h>
   5 #include "mystring.h"
   6
   7 MString mystring_new(int size, int incr) {
   8     MString string = calloc(1, sizeof(struct mystring));
   9     string->str = malloc((size+1)*sizeof(char));
  10     string->str[0] = '\0';
  11     string->len = 0;
  12     string->maxlen = size;
  13     string->incr = incr;
  14
  15     return string;
  16 }
  17
  18 void mystring_clear(MString string) {
  19     string->len = 0;
  20     string->str[0] = '\0';
  21 }
  22
  23 void mystring_enlarge(MString string) {
  24     string->maxlen += string->incr;
  25     string->str = realloc(string->str, (string->maxlen + 1) * sizeof(char));
  26 }
  27
  28 void mystring_char_append(MString string, char toinsert) {
  29     if (string->len == string->maxlen) {
  30         mystring_enlarge(string);
  31     }
  32     string->str[string->len] = toinsert;
  33     string->str[string->len+1] = '\0';
  34     string->len++;
  35 }
  36
  37 void mystring_str_append(MString string, char *toinsert) {
  38     int i;
  39     for (i = 0; toinsert[i] != '\0'; i++) {
  40         mystring_char_append(string, toinsert[i]);
  41     }
  42 }
  43
  44 void mystring_free(MString string) {
  45     free(string->str);
  46     free(string);
  47 }
  48
  49 int mystring_getline(MString string, FILE *file) {
  50     int c;
  51     int count = 0;
  52     while ((c = fgetc(file)) != EOF && c != '\n') {
  53         mystring_char_append(string, c);
  54         count++;
  55     }
  56     if (count == 0 && c == EOF) {
  57         return -1;
  58     }
  59     return count;
  60 }
  61
  62 void mystring_truncate(MString string, int index) {
  63     string->str[index] = '\0';
  64     string->len -= string->len - index;
  65 }
  66
  67 void mystring_erase(MString string, int index, int len) {
  68     memmove(&string->str[index], &string->str[index+len], string->len-len);
  69     string->len -= len;
  70     string->str[string->len] = '\0';
  71 }
  72
  73 int mystring_has_prefix(MString string, char *substr) {
  74     return !strncmp(string->str, substr, strlen(substr));
  75 }
  76
  77 int mystring_has_suffix(MString string, char *substr) {
  78     return !strcmp(string->str + string->len - strlen(substr), substr);
  79 }
  80
  81 int mystring_strip(MString string) {
  82     static int i = 0;
  83     if (string == NULL) {
  84         return i;
  85     }
  86
  87     i = 0;
  88     for (i = string->len - 1; i >= 0; i--){
  89         if (!isspace(string->str[i])) {
  90             break;
  91         }
  92     }
  93     if (i+1 < string->len) mystring_truncate(string, i+1);
  94
  95     for (i = 0; i < string->len; i++) {
  96         if (!isspace(string->str[i])) {
  97             break;
  98         }
  99     }
 100
 101     mystring_erase(string, 0, i);
 102     return i;
 103 }