X-Git-Url: https://plomlompom.com/repos/?a=blobdiff_plain;f=src%2Freadwrite.c;h=78f1bffb73d4b4472c5daa699ba4220f6c797456;hb=fdb7a8eb2bc58d180d53f4085085a62bc1f2e62b;hp=039dadea4a6855e1f2222241193897db4f987b4c;hpb=4d9b6ac142740aa337fc3e622902c9595c36f6d0;p=plomrogue diff --git a/src/readwrite.c b/src/readwrite.c index 039dade..78f1bff 100644 --- a/src/readwrite.c +++ b/src/readwrite.c @@ -1,103 +1,185 @@ /* 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. */ -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) { - if (0 != size % 8) - { - return 1; - } - int16_t bitshift = size - 8; + exit_trouble(fclose(file), f, "fclose()"); +} - * x = 0; - int test; - for (; bitshift >= 0; bitshift = bitshift - 8) - { - test = fgetc(file); - if (EOF == test) - { - return 1; - } - * x = * x + ((uint32_t) test << bitshift); - } - return 0; + + +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()"); } -static uint8_t write_uintX_bigendian(FILE * file, uint32_t x, uint8_t size) +extern void try_fputc(uint8_t c, FILE * file, char * f) { - if (0 != size % 8) - { - return 1; - } - int16_t bitshift = size - 8; + exit_trouble(EOF == fputc(c, file), f, "fputc()"); +} - for (; bitshift >= 0; bitshift = bitshift - 8) - { - if (EOF == fputc((x >> bitshift) & 0xFF, file)) - { - return 1; - } - } - return 0; + + +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 int try_fgetc(FILE * file, char * f) +{ + int test = fgetc(file); + exit_trouble(EOF == test && ferror(file), f, "fgetc()"); + return test; } -extern uint8_t read_uint8(FILE * file, uint8_t * x) +extern uint8_t try_fgetc_noeof(FILE * file, char * f) { - uint32_t y = * x; - uint8_t err = read_uintX_bigendian(file, &y, 8); - * x = (uint8_t) y; - return err; + char * f_name = "try_fgetc_noeof()"; + int test = try_fgetc(file, f_name); + exit_trouble(EOF == test, f, "fgetc() unexpectedly hitting EOF"); + return (uint8_t) test; } -extern uint8_t read_uint16_bigendian(FILE * file, uint16_t * x) +extern void try_fclose_unlink_rename(FILE * file, char * p1, char * p2, + char * f) { - uint32_t y = * x; - uint8_t err = read_uintX_bigendian(file, &y, 16); - * x = (uint16_t) y; - return err; + 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 uint8_t read_uint32_bigendian(FILE * file, uint32_t * x) +extern uint16_t get_linemax(FILE * file, char * f) { - return read_uintX_bigendian(file, x, 32); + uint16_t linemax; + exit_trouble(textfile_sizes(file, &linemax, NULL), f, "textfile_sizes()"); + return linemax; } -extern uint8_t write_uint8(uint8_t x, FILE * file) +extern uint8_t textfile_sizes(FILE * file, uint16_t * linemax_p, + uint16_t * n_lines_p) { - return write_uintX_bigendian(file, x, 8); + char * f_name = "textfile_sizes()"; + int c = 0; + uint16_t c_count = 0; + uint16_t n_lines = 0; + uint16_t linemax = 0; + while (1) + { + c = try_fgetc(file, f_name); + 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; + } + * linemax_p = linemax; + if (n_lines_p) + { + * n_lines_p = n_lines; + } + return 0; } -extern uint8_t write_uint16_bigendian(uint16_t x, FILE * file) +extern uint32_t read_uint32_bigendian(FILE * file) { - return write_uintX_bigendian(file, x, 16); + char * f_name = "read_uint32_bigendian()"; + uint32_t x; + x = (uint32_t) try_fgetc_noeof(file, f_name) << 24; + x = x + ( (uint32_t) try_fgetc_noeof(file, f_name) << 16 ); + x = x + ( (uint32_t) try_fgetc_noeof(file, f_name) << 8 ); + x = x + (uint32_t) try_fgetc_noeof(file, f_name); + return x; } -extern uint8_t write_uint32_bigendian(uint32_t x, FILE * file) +extern void write_uint32_bigendian(uint32_t x, FILE * file) { - return write_uintX_bigendian(file, x, 32); + char * f_name = "write_uint32_bigendian()"; + try_fputc( x >> 24, file, f_name); + try_fputc( ( x >> 16 ) & 0xFF, file, f_name); + try_fputc( ( x >> 8 ) & 0xFF, file, f_name); + try_fputc( x & 0xFF, file, f_name); }