X-Git-Url: https://plomlompom.com/repos/?a=blobdiff_plain;f=src%2Freadwrite.c;h=bfbd4f65987428fe2051d1b99b57cbe518ab8d1c;hb=76bcc7383e9b111e02e83c2d822633cf1be88aab;hp=2b6823adfa9bee472eb70ed9474371b607d8b46e;hpb=ad3f7d4d420b5447d756be1eaaf78f0abd1a5f65;p=plomrogue diff --git a/src/readwrite.c b/src/readwrite.c index 2b6823a..bfbd4f6 100644 --- a/src/readwrite.c +++ b/src/readwrite.c @@ -1,26 +1,154 @@ /* readwrite.c */ #include "readwrite.h" -#include /* for FILE typedef*/ -#include /* for uint16_t, uint32_t */ +#include /* for FILE typedef, fopen(), fgetc(), fputc(), fseek(), + * sprintf(), fwrite(), ferror() + */ +#include /* for uint8_t, uint16_t, uint32_t */ +#include /* for strlen()*/ +#include /* for unlink() */ +#include "rexit.h" /* for exit_err(), exit_trouble() */ +#include "main.h" /* for world global */ + + + +/* Read/write "x" from/to "file" as bigendian representation of "size" bits. On + * failure, return 1, else 0. (As of of now, all extern read/write functions + * build on top of these.) Only use multiples of 8 greater or equal 32 for + * "size", so that storage inside uint32_t is possible. + */ +static uint8_t read_uintX_bigendian(FILE * file, uint32_t * x, uint8_t size); +static uint8_t write_uintX_bigendian(FILE * file, uint32_t x, uint8_t size); -/* Read/write "x" from/to "file" as bigendian representation of "size" bits. */ -static uint8_t read_uintX_bigendian(FILE * file, uint32_t * x, uint8_t size); -static uint8_t write_uintX_bigendian(FILE * file, uint32_t x, uint8_t size); +extern FILE * try_fopen(char * path, char * mode, char * f) +{ + char * msg1 = "Trouble in "; + char * msg2 = " with fopen() (mode '"; + char * msg3 = "') on path '"; + char * msg4 = "'."; + uint16_t size = strlen(msg1) + strlen(msg2) + strlen(msg3) + strlen(msg4) + + strlen(f) + strlen(path) + strlen(mode) + 1; + char msg[size]; + sprintf(msg, "%s%s%s%s%s%s%s", msg1, f, msg2, mode, msg3, path, msg4); + FILE * file_p = fopen(path, mode); + exit_err(NULL == file_p, msg); + return file_p; +} -static uint8_t read_uintX_bigendian(FILE * file, uint32_t * x, uint8_t size) +extern void try_fclose(FILE * file, char * f) +{ + exit_trouble(fclose(file), f, "fclose()"); +} + + + +extern char * try_fgets(char * line, int linemax, FILE * file, char * f) +{ + char * test = fgets(line, linemax, file); + exit_trouble(NULL == test && ferror(file), f, "fgets()"); + return test; +} + + + +extern void try_fwrite(void * ptr, size_t size, size_t nmemb, FILE * stream, + char * f) +{ + exit_trouble(0 == fwrite(ptr, size, nmemb, stream), f, "fwrite()"); +} + + + +extern void try_fclose_unlink_rename(FILE * file, char * p1, char * p2, + char * f) +{ + try_fclose(file, f); + char * msg1 = "Trouble in "; + char * msg4 = "'."; + if (!access(p2, F_OK)) + { + char * msg2 = " with unlink() on path '"; + uint16_t size = strlen(msg1) + strlen(msg2) + strlen(msg4) + + strlen(f) + strlen(p2) + 1; + char msg[size]; + sprintf(msg, "%s%s%s%s%s", msg1, f, msg2, p2, msg4); + exit_err(unlink(p2), msg); + } + char * msg2 = " with rename() from '"; + char * msg3 = "' to '"; + uint16_t size = strlen(msg1) + strlen(f) + strlen(msg2) + strlen(p1) + + strlen(msg3) + strlen(p2) + strlen(msg4) + 1; + char msg[size]; + sprintf(msg, "%s%s%s%s%s%s%s", msg1, f, msg2, p1, msg3, p2, msg4); + exit_err(rename(p1, p2), msg); +} + + + +extern uint16_t get_linemax(FILE * file, char * f) +{ + uint16_t linemax; + exit_trouble(textfile_sizes(file, &linemax, NULL), f, "textfile_sizes()"); + return linemax; +} + + + +extern uint8_t textfile_sizes(FILE * file, uint16_t * linemax_p, + uint16_t * n_lines_p) { - if (0 != size % 8) + int c = 0; + uint16_t c_count = 0; + uint16_t n_lines = 0; + uint16_t linemax = 0; + while (1) + { + c = fgetc(file); + if (EOF == c) + { + break; + } + c_count++; + if ('\n' == c) + { + if (c_count > linemax) + { + linemax = c_count; + } + c_count = 0; + if (n_lines_p) + { + n_lines++; + } + } + } + if (0 == linemax && 0 < c_count) /* Handle files that consist of only one */ + { /* line / lack newline chars. */ + linemax = c_count; + } + + if (-1 == fseek(file, 0, SEEK_SET)) { return 1; } - int16_t bitshift = size - 8; + * linemax_p = linemax; + if (n_lines_p) + { + * n_lines_p = n_lines; + } + return 0; +} + + +static uint8_t read_uintX_bigendian(FILE * file, uint32_t * x, uint8_t size) +{ * x = 0; + int16_t bitshift = size - 8; int test; for (; bitshift >= 0; bitshift = bitshift - 8) { @@ -38,12 +166,7 @@ static uint8_t read_uintX_bigendian(FILE * file, uint32_t * x, uint8_t size) static uint8_t write_uintX_bigendian(FILE * file, uint32_t x, uint8_t size) { - if (0 != size % 8) - { - return 1; - } int16_t bitshift = size - 8; - for (; bitshift >= 0; bitshift = bitshift - 8) { if (EOF == fputc((x >> bitshift) & 0xFF, file)) @@ -58,10 +181,8 @@ static uint8_t write_uintX_bigendian(FILE * file, uint32_t x, uint8_t size) extern uint8_t read_uint8(FILE * file, uint8_t * x) { - /* Since read_uintX_bigendian() works on -- and zeroes -- four bytes, work - * on values of fewer bytes corrupts their immediate neighbor bytes. This - * necessitates working on newly acquired separate memory areas (* y), only - * copying the sufficiently small end result to * x. + /* Since read_uintX_bigendian() works on -- and zeroes -- four bytes, direct + * work on values of fewer bytes would corrupt immediate neighbor values. */ uint32_t y = * x; uint8_t err = read_uintX_bigendian(file, &y, 8); @@ -71,17 +192,6 @@ extern uint8_t read_uint8(FILE * file, uint8_t * x) -extern uint8_t read_uint16_bigendian(FILE * file, uint16_t * x) -{ - /* See read_uint8() introductory comment for rationale. */ - uint32_t y = * x; - uint8_t err = read_uintX_bigendian(file, &y, 16); - * x = (uint16_t) y; - return err; -} - - - extern uint8_t read_uint32_bigendian(FILE * file, uint32_t * x) { return read_uintX_bigendian(file, x, 32); @@ -96,13 +206,6 @@ extern uint8_t write_uint8(uint8_t x, FILE * file) -extern uint8_t write_uint16_bigendian(uint16_t x, FILE * file) -{ - return write_uintX_bigendian(file, x, 16); -} - - - extern uint8_t write_uint32_bigendian(uint32_t x, FILE * file) { return write_uintX_bigendian(file, x, 32);