4 #include <stdio.h> /* for FILE typedef, fopen(), fgetc(), fputc(), fseek(),
5 * sprintf(), fwrite(), ferror()
7 #include <stdint.h> /* for uint8_t, uint16_t, uint32_t */
8 #include <string.h> /* for strlen()*/
9 #include <unistd.h> /* for unlink() */
10 #include "rexit.h" /* for exit_err(), exit_trouble() */
11 #include "main.h" /* for world global */
15 /* Read/write "x" from/to "file" as bigendian representation of "size" bits. On
16 * failure, return 1, else 0. (As of of now, all extern read/write functions
17 * build on top of these.)
19 * Only use multiples of 8 greater or equal 32 for "size", so that storage
20 * inside uint32_t is possible. Originally a bit number check prefaced the code
21 * of both functions. It was removed as redundant due to all possible "size"
22 * values being hardcoded into the library (i.e. in all extern functions calling
23 * / wrapping around either function). If this ever changes, (re-)insert:
25 * if (0 == size || size > 32 || 0 != size % 8)
30 static uint8_t read_uintX_bigendian(FILE * file, uint32_t * x, uint8_t size);
31 static uint8_t write_uintX_bigendian(FILE * file, uint32_t x, uint8_t size);
35 extern FILE * try_fopen(char * path, char * mode, char * f)
37 char * msg1 = "Trouble in ";
38 char * msg2 = " with fopen() (mode '";
39 char * msg3 = "') on path '";
41 uint16_t size = strlen(msg1) + strlen(msg2) + strlen(msg3) + strlen(msg4)
42 + strlen(f) + strlen(path) + strlen(mode) + 1;
44 sprintf(msg, "%s%s%s%s%s%s%s", msg1, f, msg2, mode, msg3, path, msg4);
45 FILE * file_p = fopen(path, mode);
46 exit_err(NULL == file_p, msg);
52 extern void try_fclose(FILE * file, char * f)
54 exit_trouble(fclose(file), f, "fclose()");
59 extern char * try_fgets(char * line, int linemax, FILE * file, char * f)
61 char * test = fgets(line, linemax, file);
62 exit_trouble(NULL == test && ferror(file), f, "fgets()");
68 extern void try_fwrite(void * ptr, size_t size, size_t nmemb, FILE * stream,
71 exit_trouble(0 == fwrite(ptr, size, nmemb, stream), f, "fwrite()");
76 extern void try_fclose_unlink_rename(FILE * file, char * p1, char * p2,
80 char * msg1 = "Trouble in ";
82 if (!access(p2, F_OK))
84 char * msg2 = " with unlink() on path '";
85 uint16_t size = strlen(msg1) + strlen(msg2) + strlen(msg4)
86 + strlen(f) + strlen(p2) + 1;
88 sprintf(msg, "%s%s%s%s%s", msg1, f, msg2, p2, msg4);
89 exit_err(unlink(p2), msg);
91 char * msg2 = " with rename() from '";
92 char * msg3 = "' to '";
93 uint16_t size = strlen(msg1) + strlen(f) + strlen(msg2) + strlen(p1)
94 + strlen(msg3) + strlen(p2) + strlen(msg4) + 1;
96 sprintf(msg, "%s%s%s%s%s%s%s", msg1, f, msg2, p1, msg3, p2, msg4);
97 exit_err(rename(p1, p2), msg);
102 extern uint16_t get_linemax(FILE * file, char * f)
105 exit_trouble(textfile_sizes(file, &linemax, NULL), f, "textfile_sizes()");
111 extern uint8_t textfile_sizes(FILE * file, uint16_t * linemax_p,
112 uint16_t * n_lines_p)
115 uint16_t c_count = 0;
116 uint16_t n_lines = 0;
117 uint16_t linemax = 0;
128 if (c_count > linemax)
139 if (0 == linemax && 0 < c_count) /* Handle files that consist of only one */
140 { /* line / lack newline chars. */
144 if (-1 == fseek(file, 0, SEEK_SET))
148 * linemax_p = linemax;
151 * n_lines_p = n_lines;
158 static uint8_t read_uintX_bigendian(FILE * file, uint32_t * x, uint8_t size)
161 int16_t bitshift = size - 8;
163 for (; bitshift >= 0; bitshift = bitshift - 8)
170 * x = * x + ((uint32_t) test << bitshift);
177 static uint8_t write_uintX_bigendian(FILE * file, uint32_t x, uint8_t size)
179 int16_t bitshift = size - 8;
180 for (; bitshift >= 0; bitshift = bitshift - 8)
182 if (EOF == fputc((x >> bitshift) & 0xFF, file))
192 extern uint8_t read_uint8(FILE * file, uint8_t * x)
194 /* Since read_uintX_bigendian() works on -- and zeroes -- four bytes, direct
195 * work on values of fewer bytes would corrupt immediate neighbor values.
198 uint8_t err = read_uintX_bigendian(file, &y, 8);
205 extern uint8_t read_uint16_bigendian(FILE * file, uint16_t * x)
207 /* See read_uint8() introductory code comment for rationale. */
209 uint8_t err = read_uintX_bigendian(file, &y, 16);
216 extern uint8_t read_uint32_bigendian(FILE * file, uint32_t * x)
218 return read_uintX_bigendian(file, x, 32);
223 extern uint8_t write_uint8(uint8_t x, FILE * file)
225 return write_uintX_bigendian(file, x, 8);
230 extern uint8_t write_uint16_bigendian(uint16_t x, FILE * file)
232 return write_uintX_bigendian(file, x, 16);
237 extern uint8_t write_uint32_bigendian(uint32_t x, FILE * file)
239 return write_uintX_bigendian(file, x, 32);